just rewatched the 11th round....

[Allucard]

What i found interesting when I rewatched it was when Dirrell gets up, he is setting in the corner with his left hand up to his temple.........the shot was a semi-grazing punch to the jaw. I found that strange...AA looked like he would have gotten the ko in the next rd too

There was no indicator whatsoever that would happen. None. Dirrell was still winning the11th round, he didn't look any more tired than Abraham did and he had already tasted Abe's power and it didn't hurt him. On the contrary, the only indicator there was, was that Abe was about to lose the fight. Someone who believes he can win doesn't foul like that. Abe went for broke and hoped for bad reffing. He thought, I'm going to hurt him now, if he's not fully recovered then I'll finish him. That was his trick. Watch the last shot replay. There was no way in hell Abe didn't know what he was doing. He looked at Dirrell, and then threw the shot. That was no combo. That's why the ref immediately DQed him.
Also the jaw is not directly connected to the brain, still most fighters are KTFO when hit strong to the jaw. That must answer your question.

[βetamax]

There was no indicator whatsoever that would happen. None. Dirrell was still winning the11th round, he didn't look any more tired than Abraham did and he had already tasted Abe's power and it didn't hurt him. On the contrary, the only indicator there was, was that Abe was about to lose the fight. Someone who believes he can win doesn't foul like that. Abe went for broke and hoped for bad reffing. He thought, I'm going to hurt him now, if he's not fully recovered then I'll finish him. That was his trick. Watch the last shot replay. There was no way in hell Abe didn't know what he was doing. He looked at Dirrell, and then threw the shot. That was no combo. That's why the ref immediately DQed him.
Also the jaw is not directly connected to the brain, still most fighters are KTFO when hit strong to the jaw. That must answer your question.

It's the snapping motion of the head that often comes from being hit on the jaw. What happens is the brain shifts and slams into the skull causing trauma.