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Reblog cuz I headcanon that she turns him back human eventually and it gives me comfort that this can be canonically possible :)
Morrible was lying about spells from the Grimmeire being permanent. Or just mistaken. And I know this because of Boq.
You might not be able to cancel a spell once it has been casted, and the spells themselves might not stop, but you could always cast another spell to cause a different effect.
Such as Boq in act 2, Nessa's spell to take his heart was going to kill him. The spells effect was going to kill him, so Elphaba, not having much time, used a different spell to turn him into something that could survive not having a heart.
So Fiyero was turned into a Scarecrow, that doesn't mean that Elphaba couldn't find a different spell to change him back into a human.