Bisping sat down on his left hook, Luke kept is right hand low like usual because of it being easier to sneak check hooks with a low lead hand, and most importantly Luke didn't see the punch coming at all.
Just a perfect scenario for a finishing blow.
Nobody would have picked Bisping in an immediate trilogy or if they had a trilogy right now and for good reason.
Branch landing a couple shots and all of a sudden Branch almost KOd him which is hilariously overexaggerated.
His early loss should be insignificant considering Alvarez, Condit, Lawler, Hunt, Diaz, and many more have iron chins but got finished via strikes early in their careers.
Don' remember if he gas eaten hard shots from Kennedy but Jacare landed several very hard shots and Luke took it like it was nothing.