Huh.
This reminds me a crapton of a scene in Trials of Blood and Steel, where the heroine is also a superior duelist, and her enemies also learn to fear the trap she represents (that's the issue if you live in a culture that has legal duels). Anyway, some guy also cleverly thinks he can get away by fighting with dull swords.
I expect Azumi to hit him on the head or other vulnerable spots. ^^