In eastern philosophy, there is no A vs B. That is the appearance or illusion. Nothing exists without being in relation with something else (no thing in itself).
In a duel, the warrior is expected to, or encouraged to discover this. The enemy is meant to be seen as a part of the warrior. To master the opponent, or in any sense defeat him, he must first see he and the opponent as one movement.
Entering into what is called “Mushin” or mind-no-mind, he overcomes his “individualism” and sees it in a broader scope. Or, in other words, he gets over his ego, and realizes his unity with the opponent. So, in dueling, or dualism, is it the act of A vs. B or the mastery of A/B?
Are you to simply bludgeon your opponent or conquer him by mastering his movements with yours?
Perhaps the antagonism of dualities and dichotomies for that matter, is only an illusion, an appearance behind which mastery lies in seeing them as one movement.