It happened so fast. They both landed punches almost at the same time.

Montiel landed his right, but Donaire kinda rotated his turso and head away from it. Viewing the replay, Montiel indeed fail to move his head right away after he threw his right hand. Like Ted Atlas always say, "if you don't move your head, somebody will move it for ya".

Montiel could have at least bit his mouthpiece hard and tightened his neck. That would have help him.