I don’t think Hook thinks it’s a trap–as in he is playing Emma. I can’t see him doing that. But that doesn’t mean it’s not a trap. So Hook might be played by whoever sent that message.
I like the Ariel idea. If they all returned to where they came from, then she’s probably a mermaid in the waters of the EF again.
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"He was a lot of things to me" "The only conclusion was love"