I don't know about him lighting his head on fire or anything like that. He tends to keep his magic to himself in school.
Like I said, you wouldn't know the difference between him and the other students if he wasn't flying over the streets or saying chants under his breath.
Well that is just it. At the moment he would never do something like that but that is the point. It would subconciously be his own little rebelion but when you are having the diolog he could be thinking more about just how nice it would be to not have to walk today and how the onlything stoping him form doing it is the expectiations of these humans. These danm judgmental humans. "I- I think I want to." and then he starts to lift and his relaxed legs swing jsut a little bit as the tips of his toes leave the ground.
It seem nice but the implied part would be that he wanted to
and it didn't matter at all what people wanted him to do anymore.
While wrigting the scean he should sut give off the air of bliss but everyone else should seem weirded out and just a bit scared of this new chainge.