Ooh, I didn't think about the grading thing. That would probably work. Or maybe she could happen across him when he was writing in the library (because God help him if he tries to get any peace and quiet somewhere else).
Yeah, I'm sure they've been talked to about showing up at the infirmary with scorch marks and frostbite, where they inevitably agreed to back off and then go right back to it the next time they spar. And, of course, there's always the possibility that those losses of control weren't always strictly accidental; I'm sure they'd be taunting each other and one of them (and let's be honest, it'd probably be John) hitting a verbal low blow and making the other one lash out. And if Bobby actually was the one to do it, that could very well raise John's opinion of him slightly, just because for once Bobby wasn't the predictable nice guy.