As I mentioned that in the class, the beginning of the movie was so exciting. Nevertheless, I never liked its ending. As a teacher, it is ridiculous to me to make a huge sacrifice to instruct one particular student and close my eyes to everything else, even my own professional life and credit.
That terrible accident, which could easily be prevented, could cost Andrew his life for really nothing. I believe the strict teacher had psychological issues, like Obsessive Compulsive Disorder or OCD, and even worse than that, he was not aware of his issues.
On the other hand, I think Andrew was also responsible for his wretchedness. I mean much of his terrible situation was based on self-inflicted misery. If I were in his shoes, I would fiercely face up to the uncivilized music teacher and nip the evil in the bud.