Christian, hearing everything the teacher said, felt that it was all just pure bullshit. Nothing could justify the punishment he received, yet the school apparently didn't want to apologize or issue another public notice regarding him.
Since it would make them appear even more wrong after everything that had happened, the school was already forced to address his problem and concede a little, but only to avoid reopening the incident, nothing more apparently.
Christian felt a little pissed by their attitude, as if he should be the one to tolerate and endure more. However, after calming himself, he realized that in the end, it really didn't matter. Now, he could just close the incident for good anyway.
He didn't need to make the incident even bigger, giving the school more importance than they actually deserved. So, he humored the teacher in front of him, and said a few words, finding him even more of an eyesore than the previous boring class, and just wanted to return now.
