A thought just occurred to me. If Snow kills Cora, will she become as dark as the woman she kills? In 1×16 Heart of Darkness, Rumple said Snow’s heart would be darkened if she killed Regina.
YES! Yes she would. And at Paley today H and K said that they have full license to take Dark Snow as Dark as they want
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"He was a lot of things to me" "The only conclusion was love"