It sounded like something changed while Chauvin's knee was on Floyds neck, and people (bystanders, and at least one cop) were telling him to stop, and Floyd said he couldn't breathe. I think he decided to push it until Floyd died. I think he KNEW he was killing Floyd. I think that when it was reported Floyd had no pulse, and Chauvin failed to do CPR on him as he was trained to do, he wanted Floyd to be dead. But my belief doesn't matter. I also think 40 years isn't too much. In my opinion.