I could be wrong. However I just find it extremely hard a veteran cop of 6 years, with no prior, or even a complaint, woudl do this without a valid reason.
One of the stories I heard is cop sees Michael and friend walking down middle of road, pulls up to them, tells them to get on the pavement, as he drives off he gets word of the robbery on the radio. He identifies these two as possible suspects, swings car round. As he tries to get out Michael slams door in his face and hits him, then runs off. Cop gets out of car, yells freeze. Michael turns round. Then just runs at cop, cop unloads on him.