The reason I ask:

In Cotto versus Margarito, Cotto took a knee and Margarito landed a brutal shot to his head. Cotto was clearly down and it was what I would call a blatant foul. No call though.

What is the difference between that very obvious hit that was a "no call," and the AA hit on Dirrell?

Is it because Dirrell went for the oscar and not the points win?