THere is plenty of evidence in boxing itself of delated responses to being knocked out or concussed. Abraham was getting close, and he had Dirrel stunned in the 10th, but Dirrell only went down there it looked because he tripped on Abraham's foot. Sure Abraham was catching DIrrell with a few punches, but DIrrell didn't look hurt by any of them in the 11th, and there was absolutely no reason for him to give up in the fight he didn't look tired, from what I've read and heard he works out exceptionally hard, and he showed it at the end of hte Froch fight, and he looked in good shape in this fight as well. Abraham was getting close, but it was too little too late, and I think Dirrell was adjusting to it also in the 11th and he was avoiding shots better than in the 10th were it caught him by surprise.