Who did that? Let me know I'll say something to them for you, if you don't want to confront them. You need to report them though, and don't let them take the credit for it.
You need to report them or something. Dont let them get away with it. I understand not wanting to fight them or anything but you do need to report them.
Go all Geoffrey Tenant on them. Get in full Shakespearean costume, get a sword and say "I'm going to kill you" And then stab them in the shoulder. Virtually.