Going back to your initial post, if you are considering HSing perhaps it can be left alone. As you stated the teacher didn't contact you. I would imagine if his behaviour was that disruptive the school wouldn't leave you guessing. Have you spoken to the teacher, been straight to the point and asked why he can't do his homework in class? Expressed your views on "in depth" work and why he is reluctant to do this? or do you feel that you can't approach the teacher with these questions?