I really like this; it’s much more like what I imagine / look for in a wizard’s duel.

I was hoping to see a bit more discussion on Seizing the Edge, how to shift the scenario, and the back and forth of attack and defense.

Like, I can easily imagine a duel in which one participant takes the Edge and presents a scenario / attacks (“I could do this to you”), and even if the defender can overcome it, the attacker keeps piling on, using the same scenario repeatedly for new and ever worsening obstacles.
Just as easily, there can be a round where the defender not...