MINNEAPOLIS (AP) — Former Officer Derek Chauvin was justified in pinning George Floyd to the ground because of his frantic resistance, a use-of-force expert testified for the defense Tuesday, contradicting a parade of authorities from both inside and outside the Minneapolis Police Department.

Taking the stand at Chauvin’s murder trial, Barry Brodd, a former Santa Rosa, California, police officer, said officers don’t have to wait for something bad to happen; they need only to have a reasonable fear that there’s a threat and then adjust their actions accordingly.

“It’s easy to sit and judge … an officer’s conduct. It’s more of a challenge to, again, put yourself in the officer’s shoes to try to make an evaluation through what they’re feeling, what they’re sensing, the fear they have, and then make a determination,” Brodd said.

He also said he didn’t believe Chauvin and the other officers used deadly force when they pinned Floyd on his stomach, with his hands cuffed behind his back and Chauvin’s knee on his neck or neck area for what prosecutors say was 9 1/2 minutes.

Brodd likened it to a situation in which officers used a Taser on someone fighting with officers, and the suspect fell, hit his head and died: “That isn’t an incident of deadly force. That’s an incident of an accidental death.”

Several top Minneapolis police officials — including the police chief — have testified that Chauvin used excessive force and violated his training. And medical experts called by prosecutors have testified that Floyd died from a lack of oxygen because of the way he was restrained.

But Brodd said: “I felt that Officer Chauvin’s interactions with Mr. Floyd were following his training, following current practices in policing and were objectively reasonable.”

Brodd also testified that the bystanders yelling at the officers to get off Floyd complicated the situation for Chauvin and the others.

“The crowds started to grow in size, start to become more vocal. So now officers are always trained to deal with right, so what threat is the biggest threat?” he said.

“Is it the suspect on the ground in front of me in handcuffs that we have relatively controlled? Or is it the unknown threat posed by the crowd that could go from verbal to trying to interfere with my arrest process in a matter of seconds?”

Brodd also appeared to endorse what prosecution witnesses have said is a common misconception: that if someone can talk, he or she can breathe.

“I certainly don’t have medical degrees, but I was always trained and feel it’s a reasonable assumption that if somebody’s, ‘I’m choking, I’m choking,’ well, you’re not choking because you can breathe,” he said.

Chauvin, a 45-year-old white man, is on trial on charges of murder and manslaughter in Floyd’s death last May after his arrest of suspicion of passing a counterfeit $20 at a neighborhood market.

Chauvin attorney Eric Nelson has argued that the 19-year Minneapolis police veteran did what he was trained to do and and that Floyd died because of his illegal drug use and underlying health problems, including high blood pressure and heart disease. Fentanyl and methamphetamine were discovered in his system.

As the defense began presenting its case on Tuesday after the prosecution rested following 11 days of testimony and a mountain of video evidence, Nelson sought to plant doubt in jurors’ minds.

He brought up a 2019 arrest in which Floyd suffered from dangerously high blood pressure and confessed to heavy use of opioids, and he suggested that the Black man may have suffered from “excited delirium” — what a witness described as a potentially lethal state of agitation and even superhuman strength that can be triggered by drug use, heart disease or mental problems.

Nelson also elicited testimony from another witness that Floyd panicked and cried over and over, “Please, please, don’t kill me!” when officers first approached his SUV at gunpoint on the day of his death.

Nelson’s first witnesses, a now-retired Minneapolis police officer and paramedic, testified about a May 6, 2019, incident in which Floyd was arrested. That was a year before his fatal encounter with Chauvin.

Former Officer Scott Creighton said he drew his gun and pulled Floyd from a car after Floyd did not comply with orders to show his hands. Nelson twice asked questions aimed at getting the jury thinking about Floyd swallowing drugs, but Creighton said he did not see Floyd take anything.

Another witness who responded to that call, now-retired paramedic Michelle Moseng, testified that Floyd told her he had been taking multiple opioids about every 20 minutes. On cross-examination, prosecutor Erin Eldridge got Moseng to testify that Floyd’s respiratory output, pulse, heart rate, EKG and heart rhythms were normal.

The prosecution’s expert witnesses rejected the notion that Floyd’s drug use or underlying health problems caused his death. In fact, a cardiology expert on Monday said that Floyd appeared to have “an exceptionally strong heart.”

Another defense witness Tuesday was Shawanda Hill, who was in the SUV with Floyd before his ill-fated encounter with Chauvin. She said that Floyd fell asleep at some point and seemed startled when he realized police were there.

When he saw an officer at the window with a gun, Floyd “instantly grabbed the wheel and he was like, ‘Please, please, don’t kill me. Please, please, don’t shoot me. Don’t shoot me. What did I do? Just tell me what I did. Please, don’t kill. Please, don’t shoot me,’” Hill testified.

Also testifying was Minneapolis Park Police Officer Peter Chang, who helped at the scene that day. He said he saw a “crowd” growing across the street that “was becoming more loud and aggressive, a lot of yelling across the street.”

“Did that cause you any concern?” Nelson asked.

“Concern for the officers’ safety, yes,” Chang replied.

Nelson hasn’t said whether Chauvin will take the stand. Testifying could open him up to devastating cross-examination but could also give the jury the opportunity to see any remorse or sympathy on the officer’s part.