And because Regina had already cast it and opened the door once before, Z wont need to make as big a sacrifice to recast it.
I like the idea of the “door” already being open. Might mean it’s easier to travel from here to there. Perhaps Regina opened the door, but it’s Emma as the Savior/True Love Incarnate that keeps the door open for good.
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"He was a lot of things to me" "The only conclusion was love"