station. >> office err peroni orders grant and his friend off the train. >> he says, i saw you two getn the train, get off my f-ing train. so oscar comes off the train and he says, you go stand against the wall with your friends. >> on the station platform officer peroni places one of the men in handcuffs, seen on the bottom left of the screen. while his partner, officer marysol domenici, watches the others lined up against the wall. several people on the train including tommy cross begin recording the incident. >> i felt like i needed to capture this incident was because of the aggressive behavior by the officers that night. >> one camera catches officer peroni approaches oscar grant, standing in the middle, and striking him. >> you can see in the video he actually punches oscar. he punches oscar, then of course all his friends go like, wow, what's going on? hey? we're going to sue you. this is wrong. you know, what is going on? >> the police were overly aggressive, with no reason whatsoever to be as aggressive as they were. these men weren't trying to wrestle them, they weren't tryin