evidence: Moments after George Floyd was taken away in an ambulance last May, former Minneapolis Police officer Derek Chauvin was confronted by a witness who took issue with Chauvin’s kneeling on Floyd’s neck. [...] Charles McMillian, the 61-year-old witness, testified that he observed Floyd’s arrest on May 25, 2020, and that he encouraged Floyd to comply with police, repeatedly saying, "you can’t win." As Chauvin knelt on Floyd’s neck and Floyd cried out for help, McMillian can be heard on video telling police to "get your knee off his neck." [...] Prosecutors have called several bystanders to describe their horror and fear at watching Floyd die last May. Their testimony furthers the prosecution’s opening statement that asked jurors to focus on video of the 9 minutes and 29 seconds that Chauvin knelt on Floyd’s neck.