I posted something similar over in the thread about how Zelena wants to “baelfire” Regina, but that whole concept is more like unraveling past events of someone’s life in order to change the present. So Zelena could “baelfire” Regina out of existence, then they could turn it around on her and “baelfire” Zelena’s life back to the point where she was about to come to Regina’s castle, but the good guys would still have their memories of everything that came after that point, even though it had now been undone, so they could be ready and waiting for Zelena this time and defeat her.
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