Apparently it's a bus route for wayward kids, and the one in question is bipolar and regularly takes medication to keep him almost sedated. Which means, of course, that instead of getting punched in the face 20 times he should only be punched 10 times.
The kids who broke up the fight got an award from the mayor, though. Although, am I alone in thinking they did a shitty job of breaking it up? A better way to break it up: go up to the kid, say "hey!" and punch him in the ear as hard as possible.