In my youth, a big, burly WW II vet (teacher, athletic coach, principal, asst principal) would have decked the black kids, tossed them around by the scruff of the neck, hauled them off to a room, and they would have been suspended and maybe expelled.
These are murderous assaults by murderous, enraged punks.
I had the pleasure of seeing something very similar in the early 70s when I was in the 7th grade. A gang of several Amish (/s) were attacking some guy and I noticed a couple of middle age guys who happened on the scene take off their belts and wrap them around their fists. I was puzzled by it but quickly learned its purpose. It was the best bully beat down I ever witnessed.
This is a** terrorist attack*** on a kid.
Dogs that are friendly alone can get into a pack and become mankillers.