So, in your scenario, this isn't a duel?
There are no judges or verbally announced terms. There was a challenge (by them meeting on the road) and the terms are quite understood without the necessity of being spoken out loud (two men enter, one man leaves).
And moving aside our discussion of what counts as a conflict duel or not in the game. Let's discuss the fact that range bands don't matter in a duel.
If I have a Shiba Bushi armed with a Naginata fighting an unarmed Ise Zumi, no matter how hard the Shiba Bushi tries to make sure the Ise Zumi wont be able to close in on her, somehow the monk will still be able to hit her.
Granted, this was a discussion that began about range bands and how they are broken and I'm pointing out that the one scenario where range bands should be actually useful (duels), they don't matter.
Of course, my group decided that it was silly for range bands don't matter in duels and ignored this part of the book, but since we are discussing the book per se, I think it's valid point out that yes, in this case. Range bands don't work as they should.