The blood of two wickedsisters is very powerful!
Zelena uses the needle to prick herself, and mix it with Regina’s blood!
I don’t doubt the potency of blood magic from two powerful witches, but what does Zelena intend to do with this potion? Is the potion part of casting the curse or is it for something else?
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy