Board Thread:Spoilers!/@comment-9241531-20150811165057/@comment-6175354-20151014000939

Arctucrus wrote: Tvfanatic wrote: So were gonna have 3 different timelines ? Wait wait wait

I must've missed something.

What? Yes.... read the synopsis carefully. It is a flashback within a flashback episode.

Sounds like Mary Margaret is going to do something incredibly rash and careless, which will blow Emma's cover. It would explain the utter disgust on the Dark One's face, when she looked at Mary Margaret and said "you failed".