Iizasa devised a unique method to ensure warriors could train without serious injury and yet maintain a resemblance to 'riai' (integrity of principle) and combative reality. The weapon training of the ryū, in the form of kata-bujutsu (pre-arranged, combative training drills), illustrates this well. What appears to the outsider as merely a block of the opponent's attacking weapon is, in actuality, only a substitute for the part of the attacker's body intended to be cut or struck. Thus, full impact training could be maintained with safety to the practitioners. Thereby, he extended the training of his students to the use of other weapon systems as well, in order to be totally familiar with their capabilities and not be surprised on the battlefield by something unexpectedly different.