Board Thread:Spoilers!/@comment-75.120.62.171-20130126130624/@comment-5521796-20130201050616

Killian Jones wrote: I dunno :S The dagger has magic. Storybrooke has magic. All the world surrounding Storybrooke is The Land Without Magic. Taking this in account, if someone uses the Dark One's Dagger to summon the dark one from outside Storybrooke, the Dark One should not be forced to do anything, the other way round, if the Dark One is outside Storybrooke, in a place with no magic, and someone from inside summons him, the magic of the dagger will not "leave" Storybrooke, and so the  Dark One will not be forced to return.

Anyway, Mr. Gold needs to return, because of Belle. and when he crosses the line back to Storybrooke, Cora will have power over him because of the dagger.

I could be wrong XD But I think this is how it works. I think because when Gold brought magic, it stopped at the town lines, so that only Storybrooke had magic, and that's why if you crossed the line your memory was erased because outside there was no magic, that and it was part of the price for bringing it. So then the potion Gold made for one to cross the line mad it so they're retaining their FL memories and bringing that and they're magic with them outside of Storybrooke.