Opinion by Judge BERZON; Dissent by Judge CALLAHAN.
ORDER
The opinion filed on January 16, 2007 is hereby withdrawn and replaced by this concurrently filed opinion. The pending petition for rehearing en banc is denied as moot. The parties may file new petitions for rehearing.
OPINION
BERZON, Circuit Judge:Steven Fisher claims constitutional violations stemming from a twelve-hour standoff at his apartment between him and a large number of San Jose police officers, at the end of which he came out of the apartment and submitted to arrest. He sued the city of San Jose (“the City”) and several officers under 42 U.S.C. § 1983, contending, among other things, that the arrest was invalid because the police never obtained or attempted to obtain a warrant. A jury found for the defendants on all claims, including a claim for warrantless arrest. Fisher thereupon filed a renewed motion under Federal Rule of Civil Procedure 50(b) for judgment as a matter of law on the warrantless arrest claim. Granting the motion against the City, the district court ordered the City to pay nominal damages of one dollar and issued an injunction regarding future training of police officers. We uphold the district court’s ruling on appeal, as we agree that the failure to obtain a warrant under the circumstances of this case constituted a constitutional violation as a matter of law.
I. Background
A. The Standoff
On the afternoon of Saturday, October 23, 1999, Fisher bought two twelve-packs of beer and settled in at home for an evening of watching the World Series and cleaning rifles from his collection of approximately eighteen World War II-era firearms. Both the guns and the beer figured prominently in the ensuing events.
Those events began when, around midnight, Leo Serrano, a security guard at Fisher’s apartment complex, was walking near Fisher’s apartment investigating noise complaints regarding Fisher’s upstairs neighbor. Fisher’s apartment is on the bottom floor of the apartment complex and has a sliding glass door leading out to an enclosed patio; passers-by can see into the apartment through the glass door. Noticing Fisher in his apartment, Serrano *955motioned for him to come outside and speak with him. Fisher walked out, carrying the rifle he had been cleaning when Serrano called to him.
When Serrano asked Fisher about the noise coming from his upstairs neighbor, Fisher was generally unresponsive, eventually changing the subject to the Second Amendment. Throughout the short conversation, Fisher held his rifle in various positions. Whether Fisher pointed the rifle at Serrano is not clear: At trial, Serrano testified that Fisher did not, but an officer who had been called to the scene testified at trial that when he arrived at Fisher’s apartment complex, Serrano told him that Fisher had pointed the rifle toward him during the initial encounter. Either way, Serrano suspected that Fisher was intoxicated and, feeling uncomfortable and frightened in Fisher’s presence because of the liquor, the gun, and the odd reaction to Serrano’s questions, left to tell his supervisor about his interaction with Fisher. The supervisor notified the police, who responded by sending officers to the scene.
Sergeant Ryan was among the first to arrive, at around 2 a.m. After speaking with Serrano, Ryan approached Fisher’s patio and attempted to get Fisher’s attention by throwing small rocks at the sliding-glass doors. Fisher came to the door but, rather than answering Ryan’s questions, spoke in a rambling fashion of his Second Amendment rights. Ryan, too, believed that Fisher was intoxicated.
After Ryan tried to speak with Fisher, more police officers began arriving at the scene; eventually, over sixty officers participated in the standoff. Early on, some officers telephoned Fisher’s apartment. When Fisher’s wife, Sandra, answered the phone, the officers instructed her to leave the apartment, which she did. It is not clear whether she put the phone back on the hook, but it was busy throughout the remainder of the standoff. When she emerged, Sandra informed the police that no one other than Fisher was inside the apartment. She also confirmed that Fisher had eighteen rifles in the apartment and had been drinking.
At approximately 3 or 4 a.m., Jan Males, a tactical negotiator, arrived and tried to communicate with Fisher. Unprompted, Fisher informed Males that he had a right to bear arms. He invited Males into his apartment but said he would shoot her if she did come in. Males determined that this statement was a criminal threat, a felony.
Aside from that interaction, throughout the early morning Fisher repeatedly told the police to “go away, leave me alone, and don’t bother me.” Twice during that period, Officer Boler, who was observing the apartment from across the street, reported that Fisher was pointing one of his rifles at Ryan and Males, who were the officers closest to Fisher’s apartment and were sheltering themselves behind a tree. Boler also reported that Fisher was moving the rifles around his apartment. Despite these observations and the threat to Males, no officer told Fisher during those early morning hours that he was under arrest.
Fisher was last seen with a rifle at approximately 6:30 a.m. A little while later, at around 7 a.m., the Mobile Emergency Response Group and Equipment (“MERGE”) team came to the scene, replacing the patrol officers who had arrived first.1 Some of the replaced patrol officers returned to the station house to write police reports about the incident.
The MERGE team finished evacuating all residents from the surrounding apart*956ments at 7:30 a.m. At that point, believing that Fisher had committed a crime — pointing a rifle at police officers — the MERGE team focused its efforts on forcing him out of his apartment to arrest him. Officers used a bullhorn to ask Fisher to leave his apartment, but did not tell him he was under arrest. The officers had Fisher’s power turned off at 8:48 a.m. and then broke the sliding glass doors so a “throw phone”2 could be tossed through, as Fisher’s phone remained busy. At 10:52 a.m., the police set off a “flash-bang” device, designed to get Fisher’s attention and disorient him briefly. Two hours later, at approximately 1:00 p.m., the police began throwing CS gas canisters into Fisher’s apartment.3 One of the CS gas volleys sent glass flying, cutting Fisher’s forehead above one eye.
At 2 p.m., the police again attempted to contact Fisher, this time by bullhorn. They finally achieved telephone contact, via the throw phone, at 2:13 p.m. Fisher stated at that point that he was willing to leave his apartment and offered to leave naked so that the police would not suspect him of carrying a weapon. When the police told him that this was not necessary, he said that he would come out in his boxers and socks. The police approved this plan.
Fisher emerged from his apartment at 2:35 p.m. He initially followed police instructions, walking in the designated direction and keeping his hands in the air. Soon, however, he stopped walking forward. One of the officers thereupon shot him in the leg with a “sage gun,” which shoots less-than-lethal rubber bullets. Fisher then lay down on the ground, and the officers handcuffed him and took him into custody.
Some of the police officers involved in the first shift who returned to the police station after they left in the morning testified that they had intended to arrest Fisher. All the police officers who were asked at Fisher’s § 1983 trial whether they attempted to procure a warrant said they had not, including some of those who returned to the station in the morning. Also, all of the officers who were asked testified that they did not believe a warrant was necessary. Finally, all of the officers who were asked testified that they knew that judges are available twenty-four hours a day to issue warrants.
Fisher was tried for felony violations of California Penal Code sections 417 and 417.8, which prohibit, in general, drawing, exhibiting, or using a firearm or deadly weapon against a peace officer or with the intent to resist or prevent an arrest. The jury deadlocked, and Fisher then pleaded no contest to a misdemeanor charge of brandishing a firearm in the presence of a security officer.
B. The Lawsuit
Fisher and his wife sued the City, the San Jose Police Department, and several San Jose police officers. They alleged, among other causes of action, that (1) Fisher’s warrantless arrest was an unreasonable seizure; and (2) the use of the sage gun and of the CS gas constituted state law batteries. The basis for the claim against the City was that it was “either jointly and severally liable; and!or vicariously liable through the doctrine of respondeat superior for the actions of its employee police officers also named herein in their individual capacity.”
After an eight-day jury trial, Fisher filed a motion for judgment as a matter of law under Federal Rule of Civil Procedure *95750(a), but the court denied the motion. The jury then found for the defendants on all claims. After the jury verdict, Fisher filed a renewed motion for judgment as a matter of law under Federal Rule of Civil Procedure 50(b). The court denied the motion on all other grounds but granted it as to the warrantless arrest claim against the City.
In so ruling, the district court laid out its reasoning in some detail. Observing that “[t]he very circumstances under which Steven Fisher w[as] arrested negate any implication that there was any great exigency in arresting him without securing a warrant,” the court ruled that, because “between 6:30 a.m. and the time Fisher was taken into custody at 2:35 p.m., no exigency existed[,] ... Defendants ... had ample opportunity and time to seek a warrant from a neutral and detached 'magistrate,’ as they were required to do under law.” The court expressed skepticism as to why, when “well over sixty officers [were] present at the Fisher’s apartment complex,” not one of them was able to seek a telephone warrant before Fisher submitted to arrest.
The court awarded one dollar in nominal damages to Fisher and injunctive relief, ordering the City to train its officers “on what is required under the Fourth Amendment and the case law interpreting it lawfully to arrest a suspect in his or her home and on the procedures for obtaining warrants both in-person and on the telephone.” The City now appeals, challenging only the court’s constitutional determination regarding the failure to obtain a warrant.
II. Standard of Review
This appeal arises from the grant of a Rule 50(b) renewed motion for judgment as a matter of law. That Rule provides:
If the court does not grant a motion for judgment as a matter of law made [under Rule 50(a) ], the court is considered to have submitted the action to the jury subject to the court’s later deciding the legal questions raised by the motion....
Fed.R.Civ.P. 50(b). It is thus Rule 50(a) that sets out the standard for granting Rule 50(b) motions — whether there is a “legally sufficient evidentiary basis [for a reasonable jury] to find for that party on [an] issue,” and, if not, whether “a claim or defense ... can, under the controlling law, be maintained or defeated only with a favorable finding on that issue.” Fed. R.Civ.P. 50(a). “Sufficient evidence” is “evidence adequate to support the jury’s conclusion, even if it is also possible to draw a contrary conclusion.” Pavao v. Pagay, 307 F.3d 915, 918 (9th Cir.2002).
This court reviews the district court’s grant of a renewed motion for judgment as a matter of law de novo. Id. The district court’s “judgment is proper if the evidence, construed in the light most favorable to the nonmoving party, permits only one reasonable conclusion, and that conclusion is contrary to the jury’s verdict.” Id. Moreover, “when reviewing a motion for judgment as a matter of law, we apply the law as it should be, rather than the law as it was read to the jury,” even where the party failed to object to the instructions. Pincay v. Andrews, 238 F.3d 1106, 1109 n. 4 (9th Cir.2001).4
*958III. Warrantless Arrest or Seizure A. Arrest or Seizure Inside the Home and Exigent Circumstances
1. The Warrant Requirement
In general, police may not enter a person’s home to arrest him without obtaining a warrant. See Payton v. New York, 445 U.S. 573, 589-90, 100 S.Ct. 1371, 63 L.Ed.2d 639 (1980); United States v. Prescott, 581 F.2d 1343, 1350 (9th Cir. 1978).5 Indeed, “[a]t the very core [of the Fourth Amendment] stands the right of a man to retreat into his own home and there be free from unreasonable governmental intrusion.” Silverman v. United States, 365 U.S. 505, 511, 81 S.Ct. 679, 5 L.Ed.2d 734 (1961); see also Frunz v. City of Tacoma, 468 F.3d 1141, 1142 (9th Cir. 2006) (“Physical entry into the home is the ‘chief evil against which the wording of the Fourth Amendment is directed.’”) (quoting United States v. U.S. District Court, 407 U.S. 297, 313, 92 S.Ct. 2125, 32 L.Ed.2d 752 (1972)); LaLonde v. County of Riverside, 204 F.3d 947, 954 (9th Cir. 2000) (noting “the home is perhaps the most sacrosanct domain and ... there, Fourth Amendment interests are at their strongest”). To protect this right to privacy in the home, the decision as to whether sufficient probable cause exists to arrest someone at home cannot be left to police officers:
[Fourth Amendment] protection consists in requiring that [inferences from the evidence] be drawn by a neutral and detached magistrate instead of being judged by the officer engaged in the often competitive enterprise of ferreting out crime.... When the right of privacy must reasonably yield ... is, as a rule, to be decided by a judicial officer, not by a policeman or Government enforcement agent.
Johnson v. United States, 333 U.S. 10, 14, 68 S.Ct. 367, 92 L.Ed. 436 (1948); see also Steagald v. United States, 451 U.S. 204, 212, 101 S.Ct. 1642, 68 L.Ed.2d 38 (1981) (“The purpose of a warrant is to allow a neutral judicial officer to assess whether the police have probable cause to make an arrest or conduct a search.”). As a result, “the Fourth Amendment has drawn a firm line at the entrance to the house. Absent exigent circumstances, that threshold may not reasonably be crossed without a war*959rant.” Payton, 445 U.S. at 590, 100 S.Ct. 1371.
Because the warrant requirement for in-home arrests is based on an understanding of the sanctity of the home, it is primarily concerned with entries into a home to effect an arrest, not with the seizure of the individual. Thus, “the critical time for determining whether any exigency exists is the moment the officer makes the warrantless entry.” United States v. Johnson, 256 F.3d 895, 907 (9th Cir.2001) (en banc) (per curiam) (emphasis added). As explained in the Second Circuit’s opinion upon which Payton relied as “persuasive”:
To be arrested in the home involves not only the invasion attendant to all arrests but also an invasion of the sanctity of the home. This is simply too substantial an invasion to allow without a warrant, at least in the absence of exigent circumstances, even when it is accomplished under statutory authority and when probable cause is clearly present.
United States v. Reed, 572 F.2d 412, 423 (2d Cir.1978) (quoted with approval in Payton, 445 U.S. at 588-89, 100 S.Ct. 1371). Indeed, as the facts of Payton itself illustrate, a warrantless entry made for purposes of arrest or seizure is constitutionally invalid even if no arrest ensues because the suspect is not there. See id. at 576-77, 100 S.Ct. 1371.
In determining whether an' arrest occurs in a home or in a public place, “it is the location of the arrested person, and not the arresting agents, that determines whether an arrest occurs within a home.” United States v. Johnson, 626 F.2d 753, 757 (9th Cir.1980), aff'd, 457 U.S. 537, 102 S.Ct. 2579, 73 L.Ed.2d 202 (1982). Applying that concept, every court that has considered the issue, including our own, has concluded that if the police force a person out of his house to arrest him, the arrest is deemed to have taken place inside his home, and the Payton warrant requirement applies. United States v. Johnson, 626 F.2d at 757. In United States v. Al-Azzawy, 784 F.2d 890 (9th Cir.1985), for example, “the police had completely surrounded appellee’s trailer with their weapons drawn and ordered him through a bullhorn to leave the trailer and drop to his knees.” Id. at 893. Because the defendant “was in his trailer at the time he was surrounded by armed officers, and since he did not voluntarily expose himself to their view or control outside his trailer but only emerged under circumstances of extreme coercion, the arrest occurred while he was still inside his trailer.” Id.; see also Bing ex rel. Bing v. City of Whitehall, 456 F.3d 555, 564 (6th Cir.2006) (“By laying siege to Bing’s house, breaking his door and windows, and employing pepper gas, the police accomplished ... a Fourth Amendment seizure.”); Ewolski v. City of Brunswick, 287 F.3d 492, 506 (6th Cir.2002) (“[P]olice efforts to force a barricaded individual out of a home are properly treated as seizures....”); Sharrar v. Felsing, 128 F.3d 810, 819 (3d Cir.1997) (“[W]hen a SWAT team surrounds a residence with machine guns pointed at the windows and the persons inside are ordered to leave the house backwards with their hands raised, an arrest has undoubtably occurred.”); United States v. Maez, 872 F.2d 1444, 1450 (10th Cir.1989) (holding that defendant was arrested in his home when a SWAT team holding rifles surrounded his trailer and asked him to leave his home by means of a loudspeaker); United States v. Morgan, 743 F.2d 1158, 1164 (6th Cir.1984) (concluding defendant “was placed under arrest, without the issuance of a warrant, at the moment the police encircled [his] residence”).
The Al-Azzawy principle, and therefore the Payton warrant requirement, necessarily applies, moreover, to in-*960house seizures that do not amount to a formal arrest. We have held that although Fourth Amendment seizures that do not amount to arrests may be accomplished on reasonable suspicion rather than probable cause under Terry v. Ohio, 392 U.S. 1, 20, 88 S.Ct. 1868, 20 L.Ed.2d 889 (1968), the special status of in-house seizures recognized in Payton means that “probable cause is a precondition for any warrantless entry to seize a person in his home.” LaLonde, 204 F.3d at 954.6 For similar reasons, any in-house seizure must be subject to the warrant requirement as well, absent an applicable exception. We agree in this regard with the Sixth Circuit, which has reasoned as follows:
[L]ike a full-blown arrest, an investigatory detention is a seizure that is subject to Fourth Amendment scrutiny. Thus, Payton’s holding that warrantless seizures of persons in their homes violate the Fourth Amendment, absent exigent circumstances, applies ... regardless of whether the officers at issue were conducting an arrest or an investigatory detention.
United States v. Saari, 272 F.3d 804, 809 (6th Cir.2001) (citations omitted).
It therefore does not matter for present purposes whether any seizure of Fisher that occurred before he was taken into custody at the conclusion of the standoff would have amounted to an arrest or only to a Terry seizure had the seizure occurred outside the home. Either way, a warrant was presumptively required.
2. Exceptions to the Warrant Requirement
The warrant requirement, however, is not without exceptions. Defendants rely in this case on the exigency exception to the warrant requirement.
The exigency exception can excuse a warrant for an in-home arrest when probable cause exists and there is a compelling reason for not obtaining a warrant — for example, a “need to protect an officer or the public from danger, [a] need to avoid the imminent destruction of evidence, when entry in ‘hot pursuit’ is necessary to prevent a criminal suspect’s escape, [or a need] to respond to fires or other emergencies.” United States v. Brooks, 367 F.3d 1128, 1133 n. 5 (9th Cir.2004) (citations omitted), cert. denied, 543 U.S. 1058, 125 S.Ct. 864, 160 L.Ed.2d 783 (2005).
As the term “exigency” suggests,7 however, such circumstances are not alone enough to establish exigency and thereby to excuse the warrant requirement. Instead, “ ‘[w]hen an officer undertakes to act as his own magistrate, he ought to be in a position to justify it by pointing to some real immediate and serious consequences if he postponed action to get a warrant.’ ” Welsh v. Wisconsin, 466 U.S. 740, 751, 104 S.Ct. 2091, 80 L.Ed.2d 732 (1984) (quoting McDonald v. United States, 335 U.S. 451, 460, 69 S.Ct. 191, 93 L.Ed. 153 (1948) (Jackson, J., concurring)). Consequently, a situation is exigent for purposes of permitting an arrest without a warrant only if a warrant could not be obtained in time to effect the arrest safely — that is, for present purposes, without causing a delay dangerous to the officers or to members of the public. See Michigan v. Tyler, 436 U.S. 499, 509, 98 S.Ct. 1942, 56 L.Ed.2d 486 (1978) (“[A] warrant-less entry by criminal law enforcement officials may be legal when there is com*961pelling need for official action and no time to secure a warrant.” (emphasis added)); United States v. Robertson, 606 F.2d 853, 859 (9th Cir.1979) (holding exigent circumstances exist where “a substantial risk of harm to the persons involved or to the law enforcement process would arise if the police were to delay a search until a warrant could be obtained ” (emphasis added)).
Inherent in this standard, as the just-quoted italicized language indicates, are considerations regarding the time required, as a practical matter, to obtain a warrant. Consequently, where exigency is claimed, we have required “the government either to attempt, in good faith, to secure a warrant or to present evidence explaining why a telephone warrant was unavailable or impractical.” United States v. Alvarez, 810 F.2d 879, 883 (9th Cir.1987) (footnote omitted).
The appropriate moment for assessing whether the requirements for the exigency exception are met is the moment at which any entry to effect an arrest or to conduct a search occurs. See United States v. Johnson, 256 F.3d 895, 907 (9th Cir.2001) (“the critical time for determining whether any exigency exists is the moment the officer makes the warrantless entry”). Even where exigent circumstances existed to conduct a search or effect an arrest at some earlier moment, an arrest warrant will be required as soon as those exigent circumstances pass.
In Mincey v. Arizona, 437 U.S. 385, 98 S.Ct. 2408, 57 L.Ed.2d 290 (1978), for example, the Supreme Court made clear that “a warrantless search must be ‘strictly circumscribed by the exigencies which justify its initiation.’ ” Id. at 393, 98 S.Ct. 2408. The Court noted that while it was acceptable for officers arriving at the scene of a homicide to “make a prompt warrantless search of the area to see if there are other victims or if a killer is still on the loose,” no exigent circumstances justified a search of a homicide scene without a warrant once “all the persons” on the scene had been located and the suspect arrested. Id. Thus, the warrantless search of the murder scene a mere ten minutes after all injured parties were removed and the premises secured violated the Fourth Amendment. Id. at 388-89, 393, 98 S.Ct. 2408; see also Johnson, 256 F.3d at 907-08 (holding that, although there might have been exigency had the deputy pursuing the suspect followed him immediately into the house, there was no exigency by the time the deputy entered because he waited half an hour for backup to arrive and returned to the site where he lost the suspect to retrieve his pepper spray container).8
*962Here, none of the officers testified that there was any attempt to get a warrant at any point during the twelve-hour standoff, by telephone or otherwise. The City can therefore prevail only if it satisfactorily demonstrates that exigent circumstances existed such that a warrant was impractical or unavailable at the time of any entry into Fisher’s home to effect his arrest.
3. The Warrant Requirement and Stand-Offs
The City maintains that it met this standard by showing that there was a seizure of Fisher before 6:30 a.m. and that the exigency standard was met at the time that seizure occurred. We may — and will — assume that both the City’s premises are true: that is, that there was a seizure of Fisher in his home in the early morning hours and that both prongs of the exigency exception — danger and lack of time to obtain a warrant without risking harm to some person — were met at that time. But the City’s argument contains an unarticu-lated assumption — that the responsibility to obtain a warrant lapses entirely at the time a seizure first occurs, even if many hours ensue before the targeted person submits to custody and is formally arrested, and even if the police take steps in the interim period that further intrude into the surrounded house. That assumption, we conclude, is unwarranted.
We have found no case of this court that directly addresses whether police must obtain a warrant during a standoff such as occurred here between the police and a citizen if any initial exigency dissipates before further intrusions into the home to coerce the targeted individual to submit to arrest. We conclude, however, from our review of cases from other circuits involving police standoffs that the Payton warrant requirement does not evaporate the moment officers surround a home with weapons and begin to take measures to induce an individual to leave his home. Rather, officers must obtain a warrant before any additional intrusions into the home if the initial exigency dissipates sufficiently to allow the police to obtain a warrant.9 The initial exigency *963can dissipate either because the danger posed by the targeted individual decreases or because, with the passage of time, resources become available that allow the police both to maintain safety and to obtain a warrant.
To explain our conclusion, we begin by noting that in most of the cases holding that there was an in-home seizure accomplished by armed police surrounding the home, the surrounded individual left his home essentially simultaneously with the in-home seizure as he was ordered to do, and was then taken into custody by the police. See Al-Azzawy, 784 F.2d at 891; Sharrar, 128 F.3d at 815-16; Maez, 872 F.2d at 1446-47, 1449-50; Morgan, 743 F.2d at 1161. The courts in these cases had no reason to determine whether any exception operative at the outset of the action continues to apply if there is a lengthy standoff between police and the seized person. Those cases that have discussed prolonged police standoffs, however, have not treated a seizure as a single event that ends the moment a residence is surrounded, nor have they viewed the warrant requirement as lapsing once a seizure of this variety begins.
In Sharrar, for example, the court analyzed a situation in which officers surrounded the home of an individual suspected of a crime and then forced him and other occupants outside at gunpoint. See 128 F.3d, at 814-17. The court noted that “[t]he police have not satisfactorily explained why, when the house was completely surrounded by an armed SWAT team, they could not secure the premises while they went to procure an arrest warrant.” Id. at 820. The court’s analysis indicates that even if the initial surrounding of a house without a warrant is justified by exigent circumstances, the warrant requirement does not evaporate once police surround the home, and the police remain obligated to obtain a warrant once the danger has lessened or resources have become available such that a warrant could be safely obtained.
The Sixth Circuit in Bing applied this approach in its analysis of a five-hour police standoff. In that case, the police surrounded the home of a man who had fired a weapon in front of his house in the vicinity of neighborhood children. 456 F.3d at 559. Police “attempted] to force him outside” by using pepper gas and a flashbang device, and, after approximately five hours, raided his home and shot him. Id. at 559-62. In determining whether the police violated Bing’s rights by effecting a warrantless entry into his home, the Sixth Circuit first held that “[b]y laying siege to Bing’s house, breaking his door and windows, and employing pepper gas, the police accomplished a ... Fourth Amendment seizure” subject to the warrant requirement. Id. at 564. The Sixth Circuit then proceeded to analyze whether exigent circumstances existed to excuse the warrant requirement throughout the period of the standoff, ultimately holding that, under the particular circumstances, the “exigency did not terminate due to the passage of time.” Id. at 565. Bing considered whether exigency existed to justify the lack of a warrant at the time of each of the warrantless entries into Bing’s home, noting, for example, that “exigency existed to justify shooting pepper gas into the house without a warrant.” Id. at 567. The court in Bing thus necessarily recognized that passage of time during a standoff can, under some circumstances, lead to an opportunity to obtain a warrant safely *964that did not exist at the outset, and that, if such an opportunity • appears before further intrusions are made to accomplish the final arrest, the warrant requirement is not excused. Absent such an understanding, there would have been no reason for the lengthy analysis in Bing directed at demonstrating that the exigency continued throughout the course of the standoff, including before each additional police action designed to force the suspect from his home. See id. at 565-69.
Bing’s, approach is consistent with the Sixth Circuit’s other standoff cases and with the law of this circuit on exigency. In O’Brien v. City of Grand Rapids, 23 F.3d 990 (6th Cir.1994), the Sixth Circuit analyzed a standoff in which the police, after waiting outside O’Brien’s home for more than six hours, inserted three small probes without a search warrant.10 Id. at 994. The court did not consider whether exigent circumstances existed when the police first surrounded O’Brien’s home, but did hold that any exigency had dissipated by the time the probes were inserted because O’Brien “had taken no action against the officers” for the previous five hours, he was completely surrounded and could not flee the scene, and he was “not holding anyone hostage.” 11 Id. at 997. Our cases, too, assume that any exigency that exists at the beginning of a police encounter may, in some circumstances, end as a result of the passage of time or other factors, triggering a requirement to obtain a warrant. See, e.g., United States v. Lindsey, 877 F.2d 777, 782 (9th Cir.1989) (analyzing whether exigency had dissipated during a one-hour delay before arresting defendant in his home).
This approach to exigency analysis during police-citizen standoffs is consistent with the principles of Payton and the purposes of the warrant requirement. As discussed above, Payton is primarily concerned with the prevention of warrantless entries into a home. To hold that the warrant requirement ceases to apply in a standoff as soon as police have surrounded a residence would be to permit officers to invade the sanctity of the home indefinitely and in new, more intrusive ways without the oversight of a neutral and detached magistrate. Such a holding would negate the principle that officers who act without a magistrate must always be prepared to demonstrate that they could not have safely obtained a warrant. We therefore conclude that, should exigency dissipate after an individual has been seized by means of police surrounding his home but before the individual is taken into custody, officers are required to attempt to obtain a warrant before they take additional, intrusive steps to effect the arrest. This is not to say that there is no end to the warrant requirement in a standoff situation. Once officers have subdued the individual and taken him into custody, there is obviously no further need to obtain a warrant, and the application of the exigency requirement is tested by the circumstances extant before that occurred. That is why there is no need to obtain a warrant where, as in AL-Azzawy, the seizure by surrounding the house and the taking of the suspect into custody were essentially simultaneous *965and there were exigent circumstances at that time. 784 F.2d at 894 (finding exigency at time defendant was arrested). If, however, an individual remains in his home for a long period of time despite being surrounded by armed officers, his liberty has been sufficiently restrained so as to have been seized, see Ewolski, 287 F.3d at 506, but he has not yet been brought into police custody or formally placed under arrest. The police are, of course, unlikely to cease at that point to attempt to bring the suspect into actual custody and formally to arrest him. So long as the standoff continues and the police continue to make entries into the suspect’s home in order to arrest him, the Payton warrant requirement remains triggered.
As should be evident, the dissent’s suggestion, post at 15073, that we are requiring a retroactive warrant is simply incorrect. Although a seizure is initially accomplished by surrounding a home, the police in such instances may&emdash;as here&emdash; take additional steps that intrude further into the home, and do not accomplish the formal arrest until the individual surrenders. To view this entire sequence of events as a single police decision made at the outset is both to indulge in a fiction and severely to undermine the warrant requirement. So, for example, had Fisher refused to come out and had the police therefore decided forcibly to enter Fisher’s home at 2:30 p.m., that decision and action could not reasonably be viewed as outside the warrant requirement on the ground that Fisher had already been seized at home earlier.
B. The Warrant Requirement and Seizure of Fisher
The City contends that Fisher was arrested by 6:30 a.m.&emdash;after the police officers on the scene had surrounded Fisher’s home, attempted to convince him to come outside to talk, and positioned a sharpshooter to observe his actions&emdash;and that any warrant requirement applies only to the period before 6:30 a.m. Because there were exigent circumstances until 6:30 a.m., the City argues, the warrant requirement was excused. Applying the principles already discussed to the facts in the record, we conclude that the City’s position is not supported by legally sufficient evidence.
We do not disagree that Fisher was seized when police surrounded his home and stationed a sharpshooter to watch him, or that the warrant requirement applied to this seizure, absent exigency. See Al-Azzawy, 784 F.2d at 893. But despite having been seized, it is indisputable that Fisher had not yet been placed under formal arrest and brought into the custody of the police. Because Fisher remained in his house, not free to leave but not in the custody of the police, he continued to be subjected to entries into his home for the purpose of forcing him outside to arrest him, and the Payton warrant requirement continued to apply. As a result, we must ask whether any exigency that existed at 6:30 a.m. dissipated before police made further entries into Fisher’s home.12 We conclude that there was insuf*966ficient exigency to justify a warrantless arrest of Fisher at least by the time the CS gas canisters13 were thrown into his home at approximately 1:00 p.m.14
As we have emphasized, to come within the exigency exception, the City must show both that dangerous circumstances existed and that it was infeasible to obtain a warrant safely. See United States v. Manfredi, 722 F.2d 519, 522-23 (9th Cir.1984). We have used a nonex-haustive list of factors, first enunciated in Dorman v. United States, 435 F.2d 385, 392-93 (D.C.Cir.1970) (en banc), to determine whether dangerous circumstances exist for purposes of the exigency exception. See United States v. Blake, 632 F.2d 731, 733 (9th Cir.1980).15 Those criteria are: (1) “that a grave offense is involved”; (2) “that the suspect is reasonably believed to be armed”; (3) that there exists “a clear showing of probable cause”; (4) that there is “a strong reason to believe that the suspect is in the premises”; (5) that there is “a likelihood that the suspect will escape”; and (6) that peaceable entry is made onto the premises. See Dorman, 435 F.2d at 392-93.
Viewing the evidence in the light most favorable to the City, it was not unreasonable for the jury to find that the officers were justified in considering Fisher a danger both to them and to the public when they first surrounded his home in the early morning hours. Although no grave offense was involved, Fisher was armed, was certainly on the premises, and concedes that there was probable cause to arrest him. He was also intoxicated and had made at least one threatening comment to an officer.16 Moreover, it was not unreasonable for the jury to conclude that some level of danger persisted throughout the duration of the standoff, as Fisher remained inside his apartment, intoxicated and with access to weapons.
At the same time, the danger of the situation, if it did not terminate entirely after 6:30 a.m., certainly did not increase, and to some degree lessened. All nearby residents were evacuated at around 7:30 a.m. Furthermore, Fisher was not seen carrying a rifle for a full seven hours after 6:30 a.m., as the district court emphasized in granting the Rule 50(b) motion. During that posfc-6:30 a.m. period, Fisher took no *967further threatening actions, toward the police or anyone else. Nothing happened after 6:30 a.m. that increased the danger of the situation.
As to the second prong of the exigency exception — which requires that “the government ... show that a warrant could not have been [safely] obtained in time,” United States v. Good, 780 F.2d 773, 775 (9th Cir.1986) — the evidence, taken in the light most favorable to the government, clearly shows that there were enough officers working on Fisher’s case with enough time to obtain a warrant safely before the police sent the first of the CS gas canisters into Fisher’s apartment. Given the level of danger after 6:30 a.m., which remained significant but was not increasing, officers had the resources to begin the warrant process without risking the safety of officers or the public. Some of the original officers left the scene at 7 a.m. and returned to the station house, where they or their colleagues could have initiated warrant proceedings. By 1 p.m., many officers had been at Fisher’s apartment complex for several hours; in total, more than 60 officers participated over the course of the standoff between the police and Fisher. As the District Court noted, “Defendants have offered no explanation, and none exists, as to why [not] one of these officers was []able to seek and obtain a telephone warrant or make use of the procedures available twenty-four hours a day to obtain a warrant from a judge in person. ...”
These facts clearly distinguish this case from Bing, a case that is in some respects quite similar to this one. Bing had fired his gun in the vicinity of neighborhood children, “police had been called to Bing’s residence in the past[beeause] he previously had fired shots,” neighborhood residents refused to evacuate thereby increasing the danger, and police had reason to believe that Bing had fired a shot at police officers before they raided his apartment. 456 F.3d at 559-62. None of these factors existed in Fisher’s standoff with police. Moreover, as far as appears in the Bing opinion, none of the police on the scene returned to the station during the standoff. The level of danger in Bing was thus considerably higher than here, while the officers’ opportunity to obtain an arrest warrant was not obvious.
This case is also quite different from the Ninth Circuit case on which Bing relies. Unlike the one-hour delay in searching a suspect’s house that we considered in Lindsey, 877 F.2d at 782, the time the officers spent outside Fisher’s apartment complex was not unexpected, caused by lack of additional assistance, nor, comparatively, short.17 Instead, the standoff in this case is much more similar to that in O’Brien, where, after an initial confrontation, O’Brien took ho aggressive action for more than five hours, allowing the police an opportunity safely to obtain a warrant. See 23 F.3d at 997. Indeed, O’Brien arguably presented a more dangerous situation than that in this case, because police were *968aware that O’Brien had used his weapon in the past to shoot a neighbor in his front yard. Id. at 993.
The only reasonable conclusion on the record before us is that, although the situation was not without danger, the police had sufficient resources and time after probable cause was established to obtain an arrest warrant before they intruded into Fisher’s home by tossing in CS gas canisters. Although our dissenting colleague maintains, quite sensibly, that the danger created by Fisher’s actions did not completely disappear until he submitted, she fails entirely to address whether the police had enough time and manpower to seek a warrant safely during the extended standoff. Because there was such an opportunity, the failure to obtain or attempt to obtain a warrant was unconstitutional.18
IV. Conclusion
Standoffs with barricaded suspects present hard decision-making problems for police, often requiring split-second tactical determinations. The results can be tragic even when police behavior is quite reasonable. See, e.g., Ewolski, 287 F.3d at 499 (involving the target of a standoff who shot himself and his son during the standoff). A warrant may not prevent such tragic occurrences. But interposing a neutral and detached magistrate between the police, who are “acting under the excitement that attends the capture of persons accused of crime,” United States v. Lefkowitz, 285 U.S. 452, 464, 52 S.Ct. 420, 76 L.Ed. 877 (1932), and the citizen, who may or may not have committed a wrong, may, on occasion, bring a useful perspective to the situation. Id. (“[T]he informed and deliberate determinations of magistrates empowered to issue warrants as to what searches and seizures are permissible under the Constitution are to be preferred over the hurried action of officers and others who may happen to make arrests.”). The warrant requirement’s purpose is to permit a third party to evaluate whether the police should intervene in a situation at all. If not, police retreat can prevent a potentially dangerous situation from escalating into a tragic one.
Here, it may well be that a timely application to a magistrate would have resulted in issuance of a warrant for Fisher’s arrest and events would then have proceeded pretty much as they did. But that is not certain, and is in any event beside the point. The criminal jury hung on the felony count presented to it, so it is at least possible that a magistrate would have thought the police lacked probable cause on the charge for which he was arrested. More importantly, it is precisely to require the officers involved to articulate the grounds for arrest and to obtain the views of a dispassionate magistrate on the adequacy of those grounds that a warrant is required.
Here, there were plenty of police officers involved and there was plenty of time to obtain such a warrant. It was unconstitutional to fail to do so.
AFFIRMED.
. The MERGE team was called at 4:45 a.m.
. A throw phone is a phone encased in a box that also contains an open microphone.
. CS gas causes irritation and burning sensations.
. The City argues, to the contrary, that because Fisher did not object to the instructions at trial, he can make a Rule 50(b) motion only on the ground that, on the jury instructions given, no substantial evidence supported the verdict. This argument is not illogical, but it is incorrect.
True, an "appellant may not challenge on review the correctness of instructions to which he took no exceptions or only a general exception.” Air-Sea Forwarders, Inc. v. Air Asia Co., Ltd., 880 F.2d 176, 182 n. 5 (9th Cir.1989) (quoting Coca Cola Bottling Co. of Black Hills v. Hubbard, 203 F.2d 859, 862 (8th Cir.1953), and noting the Supreme *958Court’s implicit adoption of this principle in Aspen Skiing Co. v. Aspen Highlands Skiing Corp., 472 U.S. 585, 105 S.Ct. 2847, 86 L.Ed.2d 467 (1985)). But that principle does not foreclose appellate review of an underlying legal question in the case through a Rule 50(b) motion. " '[T]he failure to object to an instruction does not render the instruction the "law of the case” for purposes of appellate review of the denial of a directed verdict or judgment notwithstanding the verdict.' ” City of St. Louis v. Praprotnik, 485 U.S. 112, 120, 108 S.Ct. 915, 99 L.Ed.2d 107 (1988) (plurality opinion) (quoting City of Springfield v. Kibbe, 480 U.S. 257, 264, 107 S.Ct. 1114, 94 L.Ed.2d 293 (1987) (O'Connor, J., dissenting)). If a party moves under Rule 50 for judgment as a matter of law both before and after the verdict, as Fisher did, the motions are "sufficient to preserve the ... issue for appeal, '[ajlthough the same legal issue was raised by both those motions and [by] the jury instruction.' ” Air-Sea Forwarders, 880 F.2d at 183 (quoting Praprotnik, 485 U.S. at 120, 108 S.Ct. 915) (second alteration in original). As the jury instructions on the warrant issue do not matter to our review of the grant of the Rule 50(b) motion, we do not consider them.
. Although the words of the Fourth Amendment are familiar, it is worth recalling them before embarking on an exegesis of the warrant requirement in the unusual circumstances here presented. The Fourth Amendment reads:
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
. Fisher concedes that probable cause to believe he committed a crime existed during the standoff.
. Merriam-Webster’s Collegiate Dictionary defines "exigent” as "requiring immediate aid or action.” Merriam-Webster'scollegiate Dictionary 406 (10th ed.1999) "(emphasis added).”
. The dissent repeatedly maintains that, once exigent circumstances exist, no further actions to effect a search or seizure ever require a warrant. See Diss. Op. at 970, 971-73, 976-77 ("[n]either our precedent, nor any other federal case, has ever required officers to obtain a warrant to justify a seizure after exigent circumstances were legitimately established”). As both Mincey and Johnson, discussed above, illustrate, this is simply not so. The dissent relies heavily on Michigan v. Tyler, 436 U.S. 499, 98 S.Ct. 1942, 56 L.Ed.2d 486 (1978), in which the Supreme Court addressed "the applicability of the Fourth and Fourteenth Amendments to official entries onto fire-damaged premises.” Id. at 501, 98 S.Ct. 1942. The Court held that officials "need no warrant to remain in a building for a reasonable time to investigate the cause of a blaze” because “[plrompt determination of the fire's origin may be necessary to prevent its recurrence, as through the detection of continuing dangers such as faulty wiring” and "[(immediate investigation may also be necessary to preserve evidence from ... destruction.” Id. at 510, 98 S.Ct. 1942. The Court held that the reentry of officials four hours after the blaze was extinguished was permissible as part of that "reasonable investigation” because officials were not required to remain in the building while they were severely hampered by "darkness, steam, and smoke.” Id. at 511, 98 S.Ct. 1942.
The dissent's reliance on Tyler is misplaced. First, Tyler involved an investigation into the cause of a fire by fire officials, rather than a criminal investigation by the police. See *962Michigan v. Clifford, 464 U.S. 287, 291, 104 S.Ct. 641, 78 L.Ed.2d 477 (1984) ("in Tyler, we restated the Court’s position that administrative searches generally require warrants”) (emphasis added). Moreover, the significance of Tyler was substantially limited by Mincey, decided less than a month later, which makes clear that in the criminal law enforcement context, exigent circumstances are always assessed at the time of the search. Second, Tyler addressed a search of a burned-out furniture store, rather than a home. Id. at 297, 104 S.Ct. 641 (distinguishing Tyler as a case in which the owners had a lessened privacy interest in their property than would "a homeowner [who] ha[d] made a reasonable effort to secure his fire-damaged home”). Lastly, in Tyler the Supreme Court authorized a search that was a "continuation” of exactly the same activity in which officials had begun to engage as a result of exigent circumstances; it did not purport to excuse a situation in which officials change tactics and escalate their intrusions into an individual's home in the absence of exigent circumstances. Tyler, 436 U.S. at 511, 98 S.Ct. 1942.
The dissent's reliance on United States v. Echegoyen, 799 F.2d 1271 (9th Cir.1986), is similarly misplaced. Echegoyen, while it involved law enforcement officers, concerned a serious fire hazard. Id. at 1280. More importantly, in Echegoyen the court specifically held that there was insufficient time for officers to obtain a warrant because "the delay associated with obtaining a telephonic warrant would have unduly increased the risk that the officers reasonably believed to be present.” Id. As the dissent acknowledges, a second entry was permitted because it was itself "done to alleviate the exigent circumstances” existent at a moment when delaying to obtain a warrant would be dangerous. Id. at 1280; Diss. Op. at 973. It therefore cannot stand for the principle that warrantless entries are permitted even where there is sufficient time to obtain a warrant safely.
. We need not and do not decide whether a warrant would be required if armed police *963surrounded an individual in his home, but during the standoff made no further intrusions into the home for purposes of effecting an arrest. In this case, police clearly did intrude into the home after the initial seizure by throwing CS gas canisters into Fisher's house.
. The dissent notes, correctly, that O’Brien addresses whether and when, a search warrant is required to undertake further intrusions into a home after it has been surrounded in a standoff, not whether and when an arrest warrant is required. Diss. Op. at 976. That distinction does not matter, however, for present purposes, as the “exigency” concept is the same for the two types of warrants.
. Bing is also consistent with Ewolski, in which the Sixth Circuit held that the Fourth Amendment applies to a police standoff that ultimately ended in a raid of a home. The court did not have occasion to consider in Ewolski whether the warrant requirement applied to the standoff, nor whether any such requirement was excused by exigent circumstances.
. As noted earlier, Alvarez tolls the period of exigency during the officers' attempts to obtain a warrant, as warrants cannot be obtained instantaneously. 810 F.2d at 883 (holding that the Fourth Amendment “requires the government either ... attempt, in good faith, to secure a warrant or ... present evidence explaining why a telephone warrant was unavailable or impractical” (emphasis added) (footnote omitted)). We thus require only that officers begin to attempt to obtain a warrant when that attempt becomes feasible, given all the circumstances, while continuing in the meantime their efforts to maintain the peace and bring the suspect under control.
We also do not mean to suggest that more than one arrest warrant is required. Cf. Carlson v. Landon, 342 U.S. 524, 546-47, 72 S.Ct. 525, 96 L.Ed. 547 (1952) (recognizing that *966even once an arrest warrant is fully executed, rearrest may be possible without a new warrant, especially in cases when the detainee has escaped); United States v. Martin, 399 F.3d 879, 881 (7th Cir.2005) (“The fourth amendment's rules for warrants do not include time limits.”). Rather, our point is that there were police activities taken after 6:30 a.m. for which one arrest warrant could have been obtained without a dangerous delay, and that a warrant was therefore required.
. Tossing the CS gas canisters into the house was an independent use of force within the home. Cf. Headwaters Forest Def. v. County of Humboldt, 276 F.3d 1125, 1129-30 (9th Cir.2002) (holding that reasonable juror could conclude that use of pepper spray constituted excessive force).
. Because we conclude that there was no exigency by the time officers threw the CS gas canisters into Fisher's home at 1 p.m., we need not consider whether there was exigency at the time of any of the other intrusions into Fisher's home.
. Doman explicitly noted that the list of considerations was not comprehensive. 435 F.2d at 392.
. We note that while Fisher's comment that he would shoot the police officer if she entered his home was a threat (albeit a conditional one), the fact that he had earlier discussed his Second Amendment rights while holding a gun cannot reasonably be construed as a threat. The Second Amendment-what-ever its precise parameters, compare Nordyke v. King, 319 F.3d 1185 (9th Cir.2003), with Nordyke v. King, 364 F.3d 1025, 1026 (2004) (Gould, J., dissenting from denial of rehearing en banc)&emdash;concerns, after all, the right to “bear” arms, not the right to use them to shoot people.
. The dissent states that our "position that courts may analyze exigency after the seizure of a surrounded suspect, without evidence of any facts that negate the initial exigent circumstance, implicitly overrules Lindsey.” Diss. Op. at 971, n. 3 (emphasis added). We do not hold, however, that a warrant is required in a standoff case where nothing has occurred to negate the exigency. Here, in contrast to Lindsey, circumstances did change so as to cause the exigency to dissipate. Unlike in Lindsey, where the surrounded suspect was awaiting the return of a drug courier and likely to become more suspicious, and therefore more dangerous, with every passing minute, the passage of time at Fisher's apartment caused the exigency to lessen, as he was not seen with a weapon for at least six hours, residents were successfully evacuated, and many more officers arrived on the scene. See Lindsey, 877 F.2d at 782.
. The dissent speculates that "the officers would appear to be entitled to qualified immunity." Dissenting Opinion at 975, n. 9. As no liability was imposed on the officers, we express no opinion as to whether the officers in this or a similar case would be entitled to qualified immunity.