Okay, first of all, this is even assuming it was a Curse, and not a bean, but what if Emma didn’t cast the Curse? What if Nimue did? This could explain what happened to Merlin, after all…
Yup. Nimue “takes over” Emma’s body (probably with Emma’s permission becuase Emma has a secret plan) and kills Merlin
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"He was a lot of things to me" "The only conclusion was love"