I was right look closely at the clip with Regina and Snow when the flying primate attacks. As he picks her up he claws her arm drawing blood. The same drop of blood I speculated that the witch put in the phial!
Yup. I think Zelena needs Regina’s blood to enact this new curse. Which I guess means it has to be Regina that breaks it?
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"He was a lot of things to me" "The only conclusion was love"