Board Thread:Spoilers!/@comment-26443838-20151221213908/@comment-24674051-20151223154604

I have to agree that Emma definitly has a vengeful streak. First she had to tether herself to the darkness to save SB after Rumple nearly died, then she unwisely tethered Killian to the darkness, and now Rumple has all that darkness back. The goal was to destroy the darkness (which may be an impossible goal, but still), not to give it back to a restored Rumple.

And we see that vengefulness not in the blackmail, as much as the veiled threat of revealing Rumples Dirty secret to Belle and destroying his happiness. and not that she delivered that threat (which is the blackmail/extortion part), but in her attitude in the way it was delivered.