Board Thread:General Discussion/@comment-25926288-20150213155102/@comment-24304025-20150213155828

There were two Hooks because his past was not altered. Like if Snow had died, Emma would have vanished. By killing Eva, Zelena would have never been abandoned, nor became green nor been to Storybrooke nor traveled to the past, so she would vanish from that present-timeline and reappear somewhere, probably living happily with her mother Cora and being Leo's daughter, not even knowing he was not her father.