As you begin to draw your arm back to your body you notice that his arm has lowered once again from its resting spot on his shoulder, as if about to strike. Maybe you should strike him dead now before he gets his next shot in, just in case he has a good attack coming. Or, maybe you should defend in case this one requires your full attention to block it. At this second there is an opening in the defenses in his belly, a good spot to kill him.