It has been suggested that the shots were angled downwards, or even through the lock and hinges. That could contradict the suggestion he was shooting to kill.
It could probably be argued that if you thought there was an armed invader in your bathroom, that posed a very real threat.
if the shots were angled downwards, would that not contradict his own evidence that he didn't have his legs on? It was also such a small space, he must have known he was going to hit someone.