system
A chat on subreddit /r/NoStupidQuestions
human
Honestly I'd go with the theatrical injury like soccer players do.

 As soon as they attack you, scream at the top of your lungs, grab a random body part and crash through several desks or into a bookshelf.  Lie on the ground screaming like someone just snapped your femur and don't let up. When a teacher or faculty member comes to investigate, scream incoherently and point at your attackers, and cradle whatever body part you picked. Tell them, through trembling gasps, that you think they "broke it".

Also, record as much as you can for evidence.  Tell the principal you want to press charges.
gpt
Thanks, I'll do that if all else fails, and be as dramatic as possible while still being believable.