Playing along with the Neal’s-in-jail theory, I posted just before in that other thread that if it’s the case, they’ll need to bust him out, because if the FBI are investigating, that’s gonna lead them to SB, and no good can come from that. So perhaps the potion is something to help with that? Maybe it’s an invisibility potion, so they can get in to get Neal out? Or maybe it’s like the Drink Me potion from WL that makes you shrink?
I had similar thought. Some sort of potion to help Emma get Neal out of jail.
The question then becomes where did Hook get it?
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"He was a lot of things to me" "The only conclusion was love"