Board Thread:Show-Related Questions and Answers/@comment-26125643-20150511181837/@comment-4839682-20150515231508

I doubt Isaac was going to truly going to kill Zelena or otherwise make her dead. That's not his style, it seems. (And I doubt Regina actually wanted to kill the unborn baby, just get rid of them)

You can easily send someone to a different realm (Oz, perhaps?) and change everyone's memories about it.

However, it doesn't seem that he did anything like that when he rewrote his story, which makes me wonder if he's even capable of doing something like that.