Board Thread:Show-Related Questions and Answers/@comment-25974054-20150225003957/@comment-25926288-20150225005836

Curse 1 was casted by Regina, so likely Regina was immune to the "bad things happen when you try to leave." Also, only guided EF originals could find the town. August followed Emma, faintly. Emma went because of Henry.

Then curse broke, shields down, but memory barrier up. So, it simply swapped the cloaking/ containment spell for a memory barrier. Belle later put back up the cloaking/containment spell via Rumple's guidance. After the recasting of the Dark Curse, the memory barrier was no longer a thing. There was simply nothing, at least that we know of. When, Ingrid came along, she casted a sort of containment spell-ice wall combo, which later Elsa only gets rid of the ice wall. After Ingrid's death, I guess the containment spell like Regina's on her vault or her office keeps people out (or in which ever way you view it).

So like this, Curse of Cursed Memories and Containment is broken so the curse tries to repair itself by making a memory-containment barrier. Belle puts back up Cloaked-containment. Curse, simply to transport, happens. No barriers (except Zelena using her monkey army) Ingrid puts up Containment-Ice wall. Ice wall is removed, leaving the containment spell.