I do wonder if the PTB are canny enough to try to throw us all off the scent by having someone else planning the Queen of Hearts in this episode (since it's not like you see much of her, anyway) … even if it really is Regina's mother. The thing I keep coming back to is that Cora reminds me very much of coeur (heart in French) or corazon (heart in Spanish). or cuore (heart in Italian) …
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“Though lovers be lost love shall not;
And death shall have no dominion.”
-- Dylan Thomas