I remember margarito hitting Cotto while on a knee and nothing not even a point off ive noticed David haye go for more shots when his opponent has hit the ground mostly he does miss but if he connected he could cause himself some shit as in DQ. Then Monte Hit David while on the deck and it was a good one David got a little rest and the fight went on then Tyson dropped Orlin Norris heavy after the bell he did his own little act of bad knee and the fight was a no contest but could have easily been a DQ win for Norris. I also remember both Naz and Kevin kelley hitting eachother while touching down i think had Dirrell not fellover and rolled under the rope he would have got some rest time and Arthur would have lost a point but being Dirrell did what he did the Ref had no option. Many fighters have fouled and been fouled and got away with it sometimes it can just come down to who the ref is and how strict he is and so on.