Board Thread:Spoilers!/@comment-25733960-20150223011533/@comment-26120046-20150225212125

Whereas I agree with what some of the people above said about how Emma will turn "dark", there's another possibility to consider: blackmail.

Maybe TQoD and Rumple are about to kill someone who means a lot to Emma -like Henry, for example- and they're like "Join the dark side or we kill your son." (And then they'll probably use magic to make sure she doesn't backstab them or something, idk.)

As for the three ways to turn Emma dark, one(or more) of them could be blackmail/manipulation/magic/etc (basically everything said in these comments), but I have the feeling that there's one way for each QoD, and it'll probably have something to do with them. Like they won't choose something completely random, but instead something that happened to them or that has something to do with their backstories [?].