I hope he doesn't tell that "teacher" anything about his magic, I don't like him.
He is me too similiar to his family, when his student makes him angry he will abuse his authority to overwork the kid, even though it was his own inability that caused the child's anger against it's teacher. (People like that absolutely shouldn't have any authority.) ☠
The typical I may, but you can't.
If anyone in that house, including Will, thought John was actually abusive in any way at all he would have been fired faster than you can say the word "fired."