All or nothing, yeah. Only other thing I can think of is adding the shifts to your roll and subtracting the resist roll, which seems more likely to be broken.
I was thinking it could just be "subtract the resistance roll from 7". Plenty of items work without a roll on the user's part, after all.
Fair point, I guess. Honestly it feels like the sort of thing magic should be able to do but I wanted to avoid an offensive mental evocation. Actually it feels like the sort of thing Intimidation should be able to do... I'll look into that and see if it makes more sense to rewrite it.
If it's meant as a mental attack, I think that's a good way to handle it. But if it's meant as a boosted Brush-Off roll or something, you probably don't need to spend the shifts.
