The effect should be on the interrupt a la Wolf (or, more directly relevant, Cold Warriors
I'm hoping for an effect that's a little more interesting than simple nullification, though. The point of the example is that you can do X to hide yourself from the battle but not Y to hide yourself from the battle, because X is a valid response and Y isn't. It's easy to come up with X for dilemma nullification, but harder to come up with a good Y to go with it. (Not sure that made sense.)
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