A twister took Baby Zelena from EF to Oz, so I guess it’s possible Ruby/Mulan did, too. However, the audience shouldn’t have to come up with an explanation. That’s the responsibility of the writing team. It’s sad when the fans pay attention to detail than do the writers.
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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