I remember Regina saying that when she undid the curse, any doors between words were closed, other that the dark curse. I would say magic beans or the hat would work, but the hat is destroyed, and there are no magic beans that we know of. So how did he return to Emma? The bird didn't deliver anything other than a note and the memory potion, and obviously hook evaded the curse, had his memories, and was able to return to Emma. Also, we know hooks ship cannot travel through realms without a portal, which he said "Tiny". Any ideas?