Under is the prepositional phrase. Remember prepositional phrases show location. Under ins the only word that does that. Good luck my man.
Holden doesn't feel bad about leaving the school because school wasn't important to him. ... Holden visited Mr. Spencer because he was a teacher that he liked. He regrets visiting Mr. Spencer because he hated being pointed at for example when Mr. Spencer read his paper in front of Holden
Is Nick living up to his self proclamation of being non-judgmental?
(That's the correct sentence if that's what you're asking...)