I'm guessing the guy didn't hit back, but if he did would the passersby have stopped him saying "you are attacking the kids"?
The second case -- against a mob of 20, even a tough guy can't do anything..
If I'm a 12 year-old girl, I fight for my life, doing as much damage as quickly as possible. Taking down the leader of the group in a dramatic fashion is the best bet. Your cases are irrelevant, since they are not the subject of this thread, or the wider subject of these roving groups of blacks girls who make a sport out of beating up smaller white girls.
he second case -- against a mob of 20, even a tough guy can't do anything..
This is why a ten-round magazine limit is stupid.