Apparently that cop (Lane) told the murderer to stop three times, cited some stuff from his training and got shut down twice. He still fucked up, but comparatively should plead out with something far lesser than murder 3. Takes some balls to question a 19 year veterans actions on your 4th day.
This also should be strong evidence against Chauvin, that he was told three times not to do what he was doing by a fellow officer, and kept doing it.
To me it’s also worse for Chauvin given that he was the training officer in charge.