After the 1st punch, I would have been on the guy that was throwing punches. I have been in similar situations before, and I refuse to just stand there and watch someone take a beating like that. I am all of 5'11" and 180 lbs(solid muscular build). The big guy outweighed me by a good bit, but to just stand there and watch is assanine and intolerable. Shooting him is one thing, getting physically involved in another. I feel confident that I could hold my own in a situation like this, and If I couldn't, then I would hope that there were more people like myself standing around. The same principle of invoked fear applies here as did on the planes that hit the Twin Towers. Few aggressors can keep many locked into a passive state by the invocation of fear. People tend to have the mindset of "at least it isn't me", when in reality it is. It is that mindframe that perpetuates and feeds this aggressive behavior.