Board Thread:General Discussion/@comment-24674051-20150420171129/@comment-5925413-20160318111300

Zelena also used magic to curse Hook while she was in disguise as Ariel.

However, Regina had enchanted Hook's hook to rip only one heart out, which he did with Aurora's. When he tried to rip Zelena's, it was thanks thanks to a potion of Regina's, not directly Regina's magic.