Board Thread:Spoilers!/@comment-11464223-20131111025142/@comment-23906605-20131118030403

I'm thinking something on the likes that having the heart of the truest believer in him [Pan] is somehow going to backfire. I mean, Henry's heart had a golden aura, for crying out loud. In a metaphorical interpretation of things, its light should not "mix" well with Pan's darkness.

According to Wendy, the heart was supposed to make Pan immortal, but in the promo, I believe we see Emma taking out her sword and immediately after, Regina saying something like "If he can bleed, we can hurt him. And if we can hurt him, we can kill him.".