I think the responsibility is that of the referee at the end of the day. Someone who is meant to be independent and in control of proceedings. It was awful the way Margarito was being asked to count the fingers with his one good eye wide open. Of course he could still count, duh! It was an awful injury and he clearly couldn't see for the majority of the fight. Sometimes fights get stopped too early, but this was quite the opposite and ridiculously so.