Appellant James Hightower was convicted of malice murder, two counts of aggravated assault, one count of aggravated battery, a firearm offense, and misdemeanor obstruction in connection with the shooting death of Anthony Bowers, the aggravated assaults of Demetrius Cosby and Myeisha Brown, and the aggravated battery of Cosby. Appellant contends that the trial court erred by making a comment that improperly bolstered an expert witness's credibility and that his trial counsel provided ineffective assistance by failing to object to the comment. Appellant also contends that his conviction for aggravated assault of Cosby should have been merged into his conviction for aggravated battery of Cosby. We affirm.1
1. Viewed in the light most favorable to the verdicts, the evidence presented at trial showed the following. Shortly after midnight on March 22, 2014, Appellant called Bowers, who occasionally sold drugs, to arrange a meeting to buy some drugs. Cosby and his girlfriend Brown were at Bowers's house at the time and decided to ride along. The plan was for Bowers to drop them off at Cosby's house after making a quick detour to complete the drug deal. Bowers drove toward the Discount Mall in Fulton County and backed into the driveway of an abandoned house behind the shopping center. The three friends then waited in the car for Appellant to show up. Neither Brown nor Cosby knew whom Bowers was meeting; they had never met Appellant, and Bowers had not told them Appellant's name. As they waited, Brown was sitting in the passenger seat, and Cosby was lying down in the back seat with his head behind Brown and his feet behind Bowers.
Appellant approached the car on foot from the street, headed toward the passenger-side door, and continued around the back of the car until he reached the driver side. The *275front window was not working, so Bowers lowered the rear window and reached backward through the open window to hand Appellant a small bag of drugs. Appellant took the bag, reached into his pocket, and hesitated. Cosby, who was looking straight at Appellant, saw a gun in Appellant's pocket and immediately warned Bowers. Bowers started to drive away, but Appellant pulled out the gun and fired multiple shots into the car. Four bullets struck Bowers in the head, torso, and shoulder; he died instantly. Cosby was struck in the left hip and briefly blacked out. When he regained consciousness, the car was rolling out of the driveway and across the street because Bowers's foot was still on the gas pedal.
When the car crashed into the ditch across the street, the gunshots stopped "for a minute." At that point, Cosby was able to move his right leg. Cosby asked Brown if she could see if Appellant was still there. She saw Appellant walking toward the car, so Cosby told her to play dead. Appellant then fired four more shots into the car. One of the bullets struck Cosby in the back, paralyzing him from the waist down. Appellant left the scene, and Brown, who had not been hit, called 911.
When the police arrived, Brown told them what had happened. She described the shooter as a black man wearing a black hoodie and jeans. An officer had seen a man matching that description walking down a nearby road just before he arrived at the crime scene. The officer got back in his car and went to look for the man. He found Appellant, who is African-American, a few streets away wearing a black hoodie and dark jeans and pulled over to stop him and ask some questions. When the officer began to frisk Appellant, he ran away. The officer chased Appellant through an apartment complex and into a wooded area, where the officer found Appellant lying on the ground and arrested him. The police later recovered Appellant's cell phone at the apartment complex and a 9mm gun in the woods near where Appellant was arrested.
After Appellant was arrested, officers took a smartphone picture of him and showed it to Brown, who was still at the crime scene. She confirmed that Appellant was wearing the same clothes as the man who shot at her, Cosby, and Bowers, although Brown was later unable to identify Appellant's photo in a six-photo lineup. Cosby was hospitalized for his serious injuries; a few weeks after the shooting, a detective interviewed him for the first time. Cosby was shown a six-photo lineup and identified Appellant's photo as a picture of the shooter.
Brown and Cosby testified at trial, and Cosby again identified Appellant as the shooter. Forensic experts testified that the bullets used in the shooting were 9mm bullets fired from the gun found in the woods near Appellant and that he had gunshot residue on his hands at the time of his arrest. In addition, cell phone records showed that Appellant and Bowers exchanged text messages about buying drugs and that Appellant had called Bowers shortly before the shooting. Appellant did not testify; his theory of defense was mistaken identity.
Appellant does not dispute the legal sufficiency of the evidence supporting his convictions. Nevertheless, as is this Court's practice in murder cases, we have reviewed the record and conclude that, when viewed in the light most favorable to the verdicts, the evidence presented at trial and summarized above was sufficient to authorize a rational jury to find Appellant guilty beyond a reasonable doubt of the crimes of which he was convicted. See Jackson v. Virginia, 443 U.S. 307, 319, 99 S.Ct. 2781, 61 L.Ed.2d 560 (1979). See also Vega v. State, 285 Ga. 32, 33, 673 S.E.2d 223 (2009) (" 'It was for the jury to determine the credibility of the witnesses and to resolve any conflicts or inconsistencies in the evidence.' " (citation omitted) ).
2. Appellant contends that the trial court improperly bolstered the credibility of an expert witness in violation of OCGA § 17-8-57.2 We disagree.
*276(a) At trial, the State called Dr. Michelle Stauffenberg, the Deputy Chief Medical Examiner for Fulton County, to testify about Bowers's autopsy and the cause and manner of his death. In response to questions about her qualifications, Dr. Stauffenberg explained among other things that she had testified as a forensic pathology expert 184 times. The State then asked the trial court to qualify her as an expert, and Appellant had no objection. The court, referring back to an earlier instruction about expert witness testimony, told the jury: "She is an expert. Remember, I told you that experts, in weighing their testimony, you're not required to accept any testimony, expert or otherwise, but the doctor is a frequent witness in Fulton Courts."
(b) Appellant contends that the trial court's statement that "the doctor is a frequent witness in Fulton Courts" violated OCGA § 17-8-57, but he did not object to that comment when it was made, so we review it only for plain error. See OCGA § 17-8-57 (b). To establish plain error, Appellant must point to a legal error that was not affirmatively waived, was clear and obvious beyond reasonable dispute, affected his substantial rights, and seriously affected the fairness, integrity, or public reputation of judicial proceedings. See Felton v. State, 304 Ga. 565, 819 S.E.2d 461, 467 (2018). To show that the error affected his substantial rights, Appellant must demonstrate that it caused him harm, meaning "that the outcome of the trial court proceedings was likely affected." See id. at 573, 819 S.E.2d at 467-468.
Appellant has not shown a violation of OCGA § 17-8-57, much less an obvious error. OCGA § 17-8-57 (a) prohibits a judge from "express[ing] or intimat[ing] to the jury the judge's opinion as to whether a fact at issue has or has not been proved or as to the guilt of the accused." The trial court's comment indicated nothing about Appellant's guilt, and the fact that Dr. Stauffenberg "is a frequent witness in Fulton Courts" was not at issue. Appellant did not (and still does not) dispute that fact or Dr. Stauffenberg's qualification as an expert in forensic pathology.
Moreover, even assuming that a jury may consider a particular witness's testimony to be more credible when the judge unnecessarily mentions that the witness frequently testifies as an expert, Appellant cannot show that he was harmed. Appellant never disputed Dr. Stauffenberg's conclusions about the cause and manner of Bowers's death, which were immaterial to Appellant's defense of mistaken identity. Indeed, the only question Appellant's counsel asked Dr. Stauffenberg on cross-examination was whether she could identify the person who shot and killed Bowers, and she acknowledged that she could not. Accordingly, even if the trial court's comment made the jury more inclined to believe Dr. Stauffenberg's testimony, that comment had no likelihood of affecting the outcome of the trial.
(c) Appellant also contends that he received ineffective assistance of counsel because his trial counsel did not object to the court's comment. To establish ineffective assistance, Appellant must show both deficient performance of counsel and resulting prejudice. See Strickland v. Washington, 466 U.S. 668, 687, 694, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984). He can show neither. We have just explained that the trial court's comment did not violate OCGA § 17-8-57, and counsel does not perform deficiently by failing to make a meritless objection. See Watson v. State, 303 Ga. 758, 762-763, 814 S.E.2d 396 (2018). We also explained that the comment caused Appellant no harm, and "[t]he test for *277prejudice in the ineffective assistance analysis is equivalent to the test for harm in plain error review." Id.
3. Finally, Appellant contends that the count charging aggravated assault against Cosby should have been merged into his aggravated battery conviction because both counts were based on the same conduct - his shooting at Cosby. We disagree. The two counts did not clearly charge the same conduct, and both of the surviving victims testified that there were two separate rounds of gunshots - the first when the car was in the driveway and rolling toward the ditch, and the second after the car had crashed into the ditch. There was a distinct interval between the two rounds, and they caused distinct injuries to Cosby. One shot during the first round hit Cosby in the left hip, but he was still able to move his right leg. Only after Appellant walked back toward the car and fired the second round of shots was Cosby hit in the back and paralyzed. Because the two rounds were separated by a deliberate interval and resulted in different injuries, the trial court properly did not merge the aggravated assault and aggravated battery counts. See Regent v. State, 299 Ga. 172, 174, 787 S.E.2d 217 (2016). See also Oliphant v. State, 295 Ga. 597, 602, 759 S.E.2d 821 (2014) (finding no merger of aggravated assault counts where, after the initial shooting, one assailant returned and shot the victim in the leg).
Judgment affirmed.
All the Justices concur.