A bunch of underage kids getting drunk at a house party who don't want to get busted by the cops.
A bunch of underage kids who grew up coddled and likely never experienced having their ass whipped or even having seen a bad ass whipping. My guess is that they were scared crapless.........
My initial thought is that the assailants are anarchists with a nazi leaning but I suspect they are just wannabe punks with a 12 pack of beer in their belly, cruising the area looking for a party to crash and somebody to beat up. I also don't believe for a second that they are members of the student community but rather locals with an axe to grind..........
As for the broken jaw, that sometimes happens when you get punched out........
And the staple? It certainly wasn't imbedded by a stapler, most likely it ended up there due to him doing something stupid like eating an object on a dare that happened to have a staple embedded in it.......