Board Thread:Spoilers!/@comment-188.2.240.241-20130220203144/@comment-6195464-20130222232544

I seriously doubt they're gonna have Cora take out Snow's heart... and how the heck -wouldn't- Snow know? Even if Cora knocked her out, somehow, she'd still see Cora ahead of time. It's likely someone from the episode itself (her mother, or someone from the palace)