It will be treated as a single incident. Is that right? Honestly, I’m not sure. It if was my school, I’d have some say in it, and their previous record would count for a lot. So would the opinion of the parents of the victim, and the victim himself.
But expelling them from that school wouldn’t accomplish much (expelling them from my school would because of its particular reputation as one of the best schools - and we’d also feel more pressure to do so than a Regional Catholic College). It would not make them any less likely to do this again.
Perhaps the right school for them is in prison. Civilized people don’t do that.
Hello! That was vicious gang attack. They belong in prison.