Nicely spotted – the boundary spell could’ve been part of the dark curse, so that people couldn’t leave. Rumpel was probably counting on being able to leave when Emma lifted the curse, but I think that there is a new power at play. When Rumpel brought magic to SB, I think the price he paid was being stuck there.
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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