You defense sucks it makes no damn sense because you totally negated my attack that was made from behind you. Speed has nothing to do with it, you should not have seen or even know the attacks were coming at you, hence the roll to get behind you as you used your momentum to strike down. Fire or not your momentum is what takes precedence an should have allowed the strikes to hit you. 

Meh. Even if I do the move that will kill you because of your stance, you will undoubtedly move out of it. .