Yeah that's the Problem, what is a clear overstep? Maybe the 'victim' was totally out of His mind before, maybe he was calmed down before an raged again, maybe he was loaded up with drugs and imposed a danger to himself/Others/the Police.
It's not that you could judge what is a 'clear overstep' by the immeriate context you see in the video
I completely agree. I would like to set out some defined lines but I have no idea how to go about it. Maybe you can help?
What I can say is that a video was submitted last night of a man who was crawling to a police officer, following his orders, before being shot multiple times and killed. His name was Daniel Shaver. Please look it up and watch the video if you do not believe it is possible to make a judgement as to whether somebody has crossed a line.