Ah yes, one of his favorite ways to deal with his opponents. Have his disciple wipe the floor with them. They get eliminated and his disciple gets some additional practice. Two birds with one stone.
Forced to sell it for at least half price? Sure that sucks, but he killed it for you when you would have died without him. Can't make a profit if your dead.
Map full of mech enemies and a giant mech 'forearm' falling through the ceiling with the name of the boss on it. Are you really surprised that the final boss might just be a giant mech? Although if it is a piloted mech, it could be whatever controls it.
Who got her out of the prison? You do realize she was holding one of the prison bars, which was suspiciously undamaged, and hanging her shoes on it right?
I can't remember the name of the animated movie it was in, but the form of the 'final boss' when he said "since you shattered my dream, I'll shatter yours as well' reminds me of a creature called No Name.