For anyone interested in this story, watch this view of the incident. It's taken from the train, but has a strong audio track(of the crowd watching) and a much clearer video. Afteer watching this, I think the police force is liable, not just the officer that pulled the trigger. It's clearer here that a second cop comes in and escalates the situation, perhaps overstimulating the shooter cop's emotional state. I think the victim's friend that was also handcuffed and against the wall can legitimately sue for his impending post-traumatic stress disorder, as he watched the murder(?) from very close proximity:
This viewing is 1:59 :
http://www.youtube.com/watch?v=DUp1FA-aXdw