Evasion
Evasion is the ability to react to dangerous situations. Often, at the speeds that things may happen in a battle between ninja, this is a reflexive action that the body will take without any confirmation from the conscious mind. This could include simply jumping out of the way, sliding around a fist as it swings towards you, using a piece of the environment to block a blow or even falling back on the inability of your opponent, watching as they completely miss without any intervention from yourself.