To be honest, I think this movie could be better!

It could express more profound value and ending. This whole movie is about a psycho master and a psycho apprentice. The limitation was finally broken through under the psycho master's abuse. That topic is so sick although it may be true in lots of real cases, but it shouldn't be advocated.

Personally I think it will never be right to treat your students or apprentice like dirt! Is it really important to break through one's limitation while losing your life? If you don't have that talent, just forget it. Be a normal happy person is better that this!