Seriously, all grandstanding aside, first call the police--but I'd have a hard time leaving the scene with the girl in trouble. The guy has 5 or 6 guys tearing him a new one--I can't do a thing for him, unless I had a weapon of some sort, and even then it's probably not enough. I don't think I could leave the girl though knowing there was the possibility that I could stop it. That's not out of any chivalry; my odds of not getting killed are much better with only two assailants instead of 6, and my conscience would make me do something, as futile as it may be.
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