Also, wild wild wild guess here…but I’m betting Hook may be setting Belle & Rumple up here. He’s the only one who knows about the dagger, and yeah, he’s being good for Emma, but he’s still Hook–and he’ll still swap sides if something’s in it for him. If he finds out somehow about Belle’s past or finds a way to remind her of it, he’d probably suggest taking the Dark One along…
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Keeper of Belle's Gold magic, sand dollar, cloaks, purple FTL outfit, spell scroll, library key, copy of Romeo and Juliet, and cry-muffling pillow, Rumple's doll, overcoat, and strength, and The Timeline. My spreadsheet: https://drive.google.com/file/d/0B6r8CySCCWd9R0RUNm4xR3RhMEU/view?usp=sharing