Sorry, I may have hit the wrong reply, but the question was made for ekknap. No, the point being that the samurai had been angered, and he would have slain his opponent in anger. He recognized that and walked away.
Anger in war is useless. You use your training to remain dispassionate. That does not remove assuming the role of mad dog, but it is a role you play for maximum effect in a situation that demands it.
Hubris is another thing worse that worthless in war. It creates a hole in the understanding of one's own strength. Respect the enemy.