Board Thread:Spoilers!/@comment-26159109-20151007195419/@comment-6175354-20151117143626

Eskaver wrote: I think she's being used even though she did what she saw as good.

Exactly.... killing Zelena would have probably unleased the Darkness, so that it could infect everyone. Darkness feeds on people's fears, and Emma's greatest fear (similar to Nimue's) is the future.