Just a thought, but what if PP didn’t “let” Wendy go. What if he already brainwashed her as an agent and it was all an act, so she acted frightened, and Bae volunteered to go. You have to go willingly, and there was no other way he would go. Then when it returned, it took her brothers and her back.
Dun, dun, dunnnnnn! *cue Evil Queen’s sinister laughter*
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy