Locke
They looked like strong hands.
CK, we don't know anything about the layout of this particular nightclub. Yes, most clubs have cameras in many areas, but it is not unreasonable to believe that this particular incident occured out of sight from the camera. To top it off, these cameras aren't exactly HD. With poor lighting conditions, things will look like a big blur. In the middle of a scuffle, it might be hard to see what exactly happens. Who knowas, maybe a big fat body guard got in the way of the camera as Marshall threw the punch.
If it happened outside of a nightclub, especially a New York nightclub, it's on camera. That's a guarantee. Your point about the quality of video may be valid, but there's no way to tell.
What I do know is that whether or not he actually punched the girl, he was involved in yet another legal issue. Once or twice, you can blame it on bad luck or coincidence. After it has happened as many times as it has, it's a pattern. Personally, I doubt he punched her. The guy has too much to lose, and he knows he is walking a fine line with suspension. More than that, someone who goes out as often as he does has to know there are cameras, especially in New York. However, there is no denying that the people he hangs out with are volatile at best, and that he consistently puts himself in bad situations. He could still get suspended, but I think it's too early in the process to be able to make an educated guess on that...