Board Thread:Spoilers!/@comment-25361971-20150128004028/@comment-24674051-20150305145451

Good thought on that one. But even then, I'll stand by my comment regarding the "Tale of 2 Sisters". It is a fitting double meaning for Once.

That situation also allows for Marian to go back to Robin, only to be killed on a later mission. And Zelena quite possibly would have removed Marian's memory of being captured by Regina. (and maybe even removed Regina's memory of capturing Marian?)