TK getting upset over Razor quitting football. TK feels like he's mentored him and protected him, which he has. So the act feels like an act of betrayal to TK. This is a far cry from the TK of the start of season 1 who would probably have celebrated the act.
From the movie; Manu is one of the few people who befriends Blake from the start (the rest of the team warms up to him eventually), and insists on calling him "Mr. Blake." During the final game, Blake keeps getting manhandled by Flat-top, but when it comes time for one final pass, Manu steps up: "Mr. Blake? He will not touch you." Manu keeps his promise.