You know … I’m not positive that “Emma merely believing in the curse isn’t enough to break it.” We now know (or believe, anyway … I don’t put a lie that that past Mr. Gold 😉 ) that if Emma dies, the curse is broken.
But that doesn’t mean that’s the only way. It just means Regina can’t kill her.
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“Though lovers be lost love shall not;
And death shall have no dominion.”
-- Dylan Thomas