Board Thread:Character Discussion/@comment-27045150-20151004193558/@comment-4427410-20151005144044

''Zelena is quite powerful and still more powerful than Regina. (Regina only stunned her, not an actual overwhelming defeat since Zelena could have killed her a hundred times if she didn't need her heart or was always monologuing.''

Zelena might be somewhat more powerful than Regina. But the latter is still more than capable of killing her big sister. Being more powerful does not mean that one is immune from being killed by someone less powerful.