Accuracy
Accuracy is the ability for a player to perceive movement and coordinate strikes. Whether this is with their fist, an arrow or a fireball, it call comes down to the same ability of timing, aim and precision. As enemies become faster and more agile, a competing ninja must also continually sharpen their senses to be able to hit such an agile target. As a wise man once said "It is like trying to hit a bullet with a smaller bullet while wearing a blindfold riding a horse."