We knew there would be consequences for killing Cora
, but who knew they'd be this severe? Mary Margaret
has darkened her heart, and, if Regina's to be believed, it's only going to get darker.
So what do you think? Will Mary Margaret's heart be blackened forever, or will she find a way to become pure as the driven snow once again? Share your thoughts in the comments and on Twitter using the hashtag #BlackHeart!