Board Thread:General Discussion/@comment-6036560-20140421102126/@comment-8345449-20140422161701

Anubis16 wrote: I just thought of something here, if Zelena went back in time to kill Eva then Snow would have never been born and Snow's baby which she needs to cast this curse would not have been born either, so I don't think Zelena wants to kill Eva

Almost anything Zelena does will create a paradox of some kind. If she wants to stop Regina from being born (which like Snow says, would probably happen if Eva is killed), then Regina's heart wouldn't exist to be an ingredient in her spell either. Or more generally, if she changes the past so that she gets everything that she ever wanted then why would she have the motivation to cast the time-travel spell in the first place.

Maybe the spell itself will ensure its own existence throughout all possible timelines once its been cast so it doesn't matter how it originates. I mean its magic after all...