Neal summoned dark magic to bring back Rumple. All magic comes with a price and he was required to be a double agent for Zelena and she has his heart. Heart crushing is what that scene reminded of.
Maybe. But I don’t think his heart is crushed, but I do think she has it. If the theory is right that she is making the classic Oz characters by taking the traits from those who have them in abundance then Neal has the most heart. Question is, what does she do with it. Neal is clearly still alive in SB–but clutching his chest, like she is controlling his heart
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"He was a lot of things to me" "The only conclusion was love"