Board Thread:General Discussion/@comment-5571357-20140513150425/@comment-4196008-20140518155239

Actually I'm not sure but I think is from last year's 2x20. "The Evil Queen". Regina and Hook are in the cave in search of the diamond (Correct me if i'm wrong) and Regina makes him fall. Then he fights with  Maleficent's zombie. This is later on, explained bye Regina herself. According to her, Maleficent is cursed not to be able to die in any form which also explains how did she survived the fight with Emma.