Opinion
COLE, J.This appeal raises two issues: (1) whether the prosecutor’s persistence in questioning a witness after he had invoked his fifth amendment right against self-incrimination denied appellant a fair trial; and (2) whether the trial court erred by unfairly examining defense witnesses. Finding no error, we affirm.
Upon his trial by jury, the appellant, Leroy Cunningham (“Cunningham”), was convicted of robbery, malicious wounding and use of a firearm in the commission of a crime. He received sentences of seventeen years in the state penitentiary.
The Commonwealth’s evidence showed that on April 12, 1984, Horace Monroe, the sixty-two year old victim, was walking home from the grocery store when he noticed a man leave the Baker Street School playground and position himself on the sidewalk ahead of him. Monroe stated that he watched the man carefully as he passed within two feet of him on the sidewalk because of his peculiar behavior. Immediately after passing the man, Monroe *360testified that he heard a gunshot from behind him. As he turned instinctively to look back, a second shot pierced his right eye and passed through his nose. Monroe fell to his knees, and although he was bleeding from his right eye, he testified that he could see clearly through his left eye. Monroe stated that he again observed the face of his assailant who was now within six inches of him searching for Monroe’s wallet. After a brief struggle, Monroe surrendered his wallet, containing fifty-two dollars in cash, and his assailant fled on foot to meet two other men. All three men ran from the area. Monroe could not identify the two other individuals, but he described the man who shot him as an 18 year old black male, having a medium dark complexion and a thin mustache, and wearing a blue gym suit with white stripes down the arm and leg. He later identified Cunningham as his assailant from a photographic spread and testified at trial that there was no question in his mind that Cunningham was the perpetrator.
I.
The Commonwealth called as a witness Leroy “Weasel” Clements who, according to the Commonwealth’s theory of the case, was one of the two individuals who fled the area with Cunningham following the shooting. Clements, although not charged with any crime in connection with the shooting, was represented by counsel. As his defense, Cunningham attempted to show that Clements was actually the gunman who shot Monroe. On advice of counsel, Clements answered five preliminary questions. He then invoked the fifth amendment and refused to answer the following questions propounded by the Commonwealth:
Were you out on Baker Street School playground on April 12, 1984?
Did you shoot Horace Monroe?
Isn’t it true, sir, that you, in fact, saw the shooting of Horace Monroe?
Did you and James Rome and this man, were you all involved in that shooting?
*361Isn’t it true that you and James Rome and this man were all together, and he said he was going to go over and rob the little old man coming over the bridge; isn’t that true?
Didn’t you and James Rome run off after this man was shot?
On cross-examination, Clements continued to refuse to answer any questions. Counsel for Cunningham asked the court to direct Clements to answer his questions, but the court declined to do so. Cunningham’s counsel asked the following questions, to which Clements pled the fifth amendment:
Do you recall telling Douglas Cunningham that you were the man who shot Horace Monroe?
Mr. Clements, do you recall meeting with James Rome on the evening of April 12, the date of the robbery?
Do you recall telling James Rome at that time that you were the man who shot Horace Monroe?
Do you recall meeting with the defendant on the sidewalk and James Rome at that time telling the defendant that you were the person who shot the old man?
Mr. Clements, if you were not involved in this, why would it incriminate you to tell this jury what you were doing and what you saw?
Cunningham contends that by continuing to question Clements after a fifth amendment privilege claim had been made, the prosecutor unfairly implanted his guilt in the minds of the jury, thereby prejudicing his defense. Cunningham contends that he was deprived of his constitutional right to confront the witness.
The fifth amendment does not provide a blanket right to refuse to answer any questions. Once a witness asserts his fifth amendment right, some investigative questioning must be allowed, *362for it is well settled that the “prosecutor need not accept at face value every asserted claim of privilege, no matter how frivolous.” Namet v. United States, 373 U.S. 179, 188 (1963). By its language, the fifth amendment privilege pertains only to situations where an individual is compelled to become “a witness against himself.” The Constitution of Virginia likewise confers a right to a witness to be free from being compelled “to give evidence against himself.” Va. Const., art. I, § 8.
The question whether the privilege is properly invoked is one for the trial court. As stated by the Supreme Court in Hoffman v. United States, 341 U.S. 479 (1951):
The witness is not exonerated from answering merely because he declares that in so doing he would incriminate himself — his say-so does not of itself establish the hazard of incrimination. It is for the court to say whether his silence is justified, . . . and to require him to answer if ‘it clearly appears to the court that he is mistaken.’
Id. at 486 (citations omitted).
The Commonwealth’s theory of the case was that Clements possessed nonprivileged information that could properly be used to corroborate its case. This theory was that Clements saw Cunningham shoot Monroe. The trial court acted correctly in allowing the prosecutor and Cunningham’s counsel to attempt to elicit the non-privileged information. In fact, it turned out that self-incrimination was not Clement’s primary concern:
The Commonwealth: Isn’t it true, sir, have you told me and your lawyer as well that the reason you are not testifying is because you are scared of his brother, not because you are afraid of incriminating yourself?
A: Yes.
Cunningham’s counsel specifically requested during cross-examination that Clements be compelled to testify. The Commonwealth had already made the same request. At first the trial court refused, adding that it would consider later Clements’ potential tes*363timony in camera.
Upon completion of all the evidence the trial court invoked Code § 19.2-270, called Clements as a court witness, and ordered him to testify. Clements stated that Cunningham shot Monroe. Cunningham’s counsel then conducted a vigorous and thorough cross-examination of Clements, unfettered by any claim of privilege. Cunningham’s assertion that the trial court denied his right to effectively confront and cross-examine Clements is refuted by the record.
Code § 19.2-270 benefits both the witness-in-jeopardy and the accused by immunizing the witness. Benefit to the witness from use of immunity is manifest. The benefit to the accused lies in taking away the obstacle to confrontation posed by the witness’ continued assertion of the fifth amendment privilege. A third, and equally important, benefit accrues to the truthfinding process. As the trial judge stated: “The reason behind this statute ... is obvious. There is a search for justice and we must have the truth.” Since the error of which Cunningham complains only results where “inferences from a witness’ refusal to answer added critical weight to the prosecution’s case in a form not subject to cross-examination,” Namet, 373 U.S. at 187, any such infirmity at Cunningham’s trial was cured by his extensive cross-examination pursuant to Code § 19.2-270. After Clements was compelled to testify under the grant of immunity, the “critical weight” came not from Clements’ earlier invocation of privilege, but rather from his testimony that he had seen Cunningham shoot Monroe.
Immunization of the witness to protect Cunningham, Clements and the Commonwealth distinguishes the case at bar from all the cases on which Cunningham relies to support his prosecutorial misconduct contention. Cf. Namet v. United States, 373 U.S. 179 (1963); United States v. Mayes, 512 F.2d 637 (6th Cir.), cert. denied, 422 U.S. 1008 (1975); United States v. Maloney, 262 F.2d 535 (2d Cir. 1959); State v. Corrales, 138 Ariz. 583, 676 P.2d 615 (1983); People v. Berg, 59 N.Y.2d 294, 464 N.Y.S.2d 703, 451 N.E.2d 450 (1983); People v. Malphurs, 111 App. Div. 2d 266, 489 N.Y.S.2d 102 (1985); West v. State, 74 Wis.2d 390, 246 N.W.2d 675 (1976). Although no Virginia cases on point can be found, immunization has been held in other jurisdictions to cure any possible prejudice, because the defendant is enabled to cross-examine. See Annot., 19 A.L.R. 4th 368, 416-418 (1983).
*364In sum, Cunningham’s confrontation rights and Clements’ rights against self-incrimination were adequately protected by the trial court. In addition, Clements’ important testimony, which corroborated the victim’s eyewitness account, was put before the jury. Cunningham has shown no error.
II.
Cunningham claims that the trial court unfairly projected itself into the examination of the defense witnesses. A review of the record discloses a number of specific complaints.
Cunningham claims that the trial court prevented him from establishing why the witness, Linda Diane Cunningham, remembered the clothing he was wearing at the time of the crime and in so doing improperly commented upon the evidence.
Linda Cunningham, sister of appellant, testified that her brother came home on April 12, 1984, at about 6:00 p.m. and was wearing a red shirt and bluejeans. On cross-examination she was asked by the Commonwealth’s Attorney how she remembered so clearly what he was wearing on April 12, 1984. She replied: “I was there and I remember what he was wearing.” Later in the interrogation she stated again that “[t]he only reason I am sure I know what he was wearing on the 12th is because he came in the house and was talking to me.” A third time, in response to the same question, she said: “[BJecause he came in the house to talk to me on April 12 and I remember what he had on.” On redirect examination Cunningham’s counsel asked some leading questions indicating that there might be something significant about the 12th that would make her remember. The court sustained the objections to those leading questions, and stated that if the question was framed correctly he would permit it. We find nothing in the record to support the contention that the trial court improperly ruled upon the admissibility of the evidence or improperly commented upon the evidence.
Cunningham contends that the court prevented him from cross-examining the victim about the acuity of his vision after he testified that he wore reading glasses and that his identification of Cunningham was made when the assailant was close to him. Monroe testified that he wore reading glasses when he read, but at the time of the incident he was not wearing them. Cunningham’s *365counsel asked one confusing, awkwardly worded compound question. Upon objection, the trial court properly sustained the objection to the question. Counsel asked no further questions on the subject, and he was not prevented by the trial court from pursuing the matter further had he so desired. There is no merit to this argument.
Appellant cites a series of excerpts from the transcript and argues that the trial court questioned defense witnesses more frequently than witnesses for the Commonwealth. He concludes that this pattern showed bias and prejudice on the part of the trial judge against him.
The conduct of a trial is committed to the sound discretion of the trial court. Justus v. Commonwealth, 222 Va. 667, 676, 283 S.E.2d 905, 910 (1981), cert. denied, 445 U.S. 983 (1982). A trial judge has the right, and sometimes the duty, to question witnesses, but neither opinion on the evidence nor bias may be disclosed. Goode v. Commonwealth, 217 Va. 863, 865, 234 S.E.2d 239, 240 (1977). To warrant reversal, error must be more than mere impatience; it must prejudice the minds of the jury against the accused or influence them in weighing the evidence. Moore v. Commonwealth, 186 Va. 453, 463, 42 S.E.2d 871, 876 (1947). In Parsons v. Commonwealth, 154 Va. 832, 152 S.E. 547 (1930), the appellant claimed that his trial judge interfered with the testimony so frequently as to deny him a fair trial. In Parsons the appellant cited a series of transcript excerpts to show bias without actually “laying his finger” on the error. Cunningham’s claims suffer from the same infirmity. This court has no duty to deduce bias from the record. 154 Va. at 851, 152 S.E. at 554.
A review of the record does not disclose that the trial judge made any commefits upon the testimony of the witnesses. He asked some questions of the witnesses to clarify their testimony and to bring out some evidence not fully developed by counsel. The interrogation was fair to both sides. It was as beneficial to Cunningham as to the Commonwealth. As stated by Cunningham, “this was a hotly contested case.” Many objections were made by counsel for both sides which required the trial judge to inquire into the purpose of the evidence and to rule upon the objections. The judge also had to warn the prosecutor to confine himself on redirect to the scope of the cross-examination, not to repeat testi*366mony, and not to echo responses on cross-examination. The court had to warn defense counsel not to incorporate argument into his opening statement, not to echo responses on cross-examination, to keep his inquiries relevant to the case being tried, not to add interpretations to responses of witnesses, not to ask repetitive questions, or questions calling for hearsay responses. The court had to warn counsel for both sides that examination of witnesses was limited to direct, cross and redirect, and to “stop making comments at each other.” The trial judge cannot be accused of projecting himself into the case when he is required to deal with problems of this nature.
Cunningham contends that the court improperly engaged in extensive cross-examination of two important defense witnesses, Cathy Carter and William Edward Jones, Jr., and that this was prejudicial; that the court prevented the treating doctor from testifying whether a person shot through the nose and eye would bleed at the points where the bullet entered and exited the nose; that the court acted improperly when, at the conclusion of all the evidence, it recalled Leroy “Weasel” Clements to the stand, sua ponte, granted him immunity under Code § 19.2-270, and ordered him to testify; and that the court recalled to the witness stand a defense witness out of the presence of the jury and warned her of perjury, thus indicating the attitude of the court toward Cunningham’s case. Cunningham made no objections to the actions of the trial court in any of these instances. He is not entitled to raise these issues for the first time on appeal. Rule 5A:18. Had he directed the trial court’s attention to his perceived grievances, the court would have had an opportunity to ensure that the jury was left with no misapprehensions about its conduct. Dickerson v. Commonwealth, 186 Va. 951, 961-962, 45 S.E.2d 243, 248 (1947).
For these reasons, the judgment of the trial court is affirmed.
Affirmed.
Duff, J., concurred.