Transcript for Bystanders plead with and try to stop officers from holding down George Floyd: Part 4
up so much about, what are you supposed to do when you see officers trying to make an arrest like this and you see something you don't think is right? Oh, my god. I can't breathe. I can't breathe. I can't breathe. Relax. I can't breathe! You're doing fine. You're talking fine. Get off his neck! I think in many ways, those bystanders were like many of us who thought they were witnessing something awful, a crime, and they want it to stop. But they also know that they're powerless, that they can get but so close to the flame before they might be burned. You can get him off the you're being a bum. You can get him off the ground, bro. Donald Williams was one of the most vocal bystanders on the scene that day. He had no feeling. He had no emotions. You know, you look in a man's eyes, and you can tell a man who they are by looking through their soul, and he had none. He's not resisting arrest or nothing. He knew what he was doing in a way, or he had done it before. He just don't care. Donald Williams is from Minneapolis, and he went to cup foods that day, just to pop in to grab something quick, and he started yelling at the officers, calling them names, and trying to get their attention, saying look, it looks you're holding him in a blood choke. You're trapping his breathing right now, bro. Being realistic at the moment, all I could do is speak and yell and, you know, tell them what they were doing was wrong. You're stopping his breathing. And hope they understand this is another human being they are doing that to. I can't breathe, officer. You see Floyd talking. You see him begging for his life. He's calling for his mother. When I heard him say mama, that's when it got real with me. Wow. It was through him saying -- that's the part. He went back when his mama died. His nose is bleeding. Like, come on now. I couldn't believe how long it went on. Aah! At one point Derek chauvin looked into the camera, and it was just this impassive, coldhearted look. He's enjoying that! He had his hands in his pocket. It was like he was on vacation. I said, should we roll him on his side? And I believe chauvin said, you know, we have him, an ambulance is coming, and we got him, we're just going to hold here. He's not breathing. We have a woman come into the video, and she says, I'm a Minneapolis firefighter. Is everything okay? Do you have a pulse? You have a firefighter. They're trained as emergency medical technicians. They're on the scene. Are you really a firefighter? Officer Thao asks her to get on the sidewalk. Check his Pulse! And as a firefighter and an emt is concerned they're holding him down this long and he a peers to be unconscious. Bro, he has not moved one time! The reaction from Derek chauvin is he immediately grabs his mace and starts to shake it. He got mace. I think for so many people that just showed for them how it seemed like how little George Floyd's life mattered to Derek chauvin and to the officers around, that what mattered more was instituting whatever version of law and order they felt was appropriate at the time. Everyone was yelling, check his pulse. He can't breathe. Check his pulse! If Derek chauvin had the knowledge that there was no pulse, he should have rolled him over immediately and started performing cpr immediately. That should've been it. Them people that was around, they tried their best to do whatever they could. And that other cop stopped that. You're stopping people from My heart goes out to the witnesses that saw him while he was still moving on the ground. When I came outside, he was limp. And at this point I'm standing with my hands on my head, observing helplessly. I think in many ways, that crowd on the sideline represents America on the sidelines watching that videotape. Like, stop. Why? He can't breathe. Can't you see that? Show him some humanity. And they didn't. 9 minutes and 29 seconds. It's not the same as an instant when a gun goes off. Everybody watched him. I watched him murder this man. I watched his life come out of his body. Why? Because I watched this man murder another man that look like me. For no reason.
This transcript has been automatically generated and may not be 100% accurate.