He was getting tagged by feather fisted Bradley which seemed to knock his head back and hurt him. Marquez may finish him for good in the fifth fight.
Bradley was swinging for the fence that time,,... And he is not feather-fisted. He made a pizza out of Provodnikov's face, almost scored a knock down against Marquez, and the only guy to knock Casamayor down for a number of times. Feather-fisted is Malignaggi, not Bradley..
I don't think his chin is gone, I think he just reacts differently to getting hit after the recent KO. If Bradley was a bigger puncher, Pac probably would've been KO'd.