I've seen that 2nd vid before, it's mad. I think it's the bloods vs the crips or somethin like that. Near the end did you see the bodies all over the floor, and there was people on fire, how mad is that.
It's hard, but if you try and look at the small individual fights going on around the main crowd, it seems as though none of these are actually amazing fighters, just getting their confidence from, the pack mentality.