Board Thread:General Discussion/@comment-5106672-20141117061053/@comment-5106672-20141117151946

I also think the Sorcerer really can achieve such magic, and this is why Rumple was trying to get his hat as a plan B to go to Bae. And of course, no way would the Sorcerer use his door to help the Dark One. It might even be that the Door could preserve the power of those who cross it even in the Land Without Magic, which would explain why Ingrid could perform the memory spell on Emma without bringing anything over from Arendelle (she certainly travelled light, didn't she?).

As for Oz, my theory is that it is a somewhat easier land to reach. Portals to (and possibly from) Oz can form spontaneously at random, such as the ones that brought Zelena and then Dorothy there via a tornado (and also Walsh, btw). It is part of its magic, kinda like the physics-defeating feats in Wonderland. You can get there through conventional means (the Hat), but if you're lucky enough, you can get a free ride. So Zelena, who had had all the plan to get rid of Dorothy ready, could have known of some spontaneous portal from Oz to the Enchanted Forest and teleported Glinda onto it, leaving the tornado or whatever that was to do the rest for her. And then seal her away to some far off corner of Fairy Tale Land with a cloaked door once she went back to the Enchanted Forest herself.

And this might be it as for abnormal world-travelling. We still have two issues with time travel.