But we see Snow in the Vault with a glowing heart.
That doesn’t necessarily mean that she kills someone by crushing that heart though. Promos are designed to trick us. 😉
I believe that Snow still has the candle, and will use it to save someone, (likely Charming), and kill Cora. Though I’ve been holding out hope that Regina would kill Cora, doing it this way instead would be perfectly poetic, because Cora tricked Snow into taking the object which was ultimately used to kill her. Cora wanted to turn Snow’s heart to coal. Karma can be a real *bleep*.