Perhaps the car/tying up was Rumple’s idea…
Maybe there’s a protection spell that they had to get past.
Maybeeeeeeeeee….I dunno. It does seem an odd way for Rumple to deliver him up when poof is also an option. But perhaps there’s a reason they need the car. Or another plan going on.
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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