We’ve been all talking abut how Emma felt and the sacrifice and how Regina felt because Emma sacrificed for her but we are forgetting another thing.
Regina just spent half the season trying to keep Emma from going dark. She said so herself. She was like *protect Emma heart at all costs* and if we think back, even as far as Neverland, when they disagree with taking the lost boy’s heart with snow? She was there to do the dirty work, not Emma. She cherishes the light on Emma. We saw scenes this season, dedicated to Regina talking Emma down from darkness, reaching for her, talking about protecting her heart from darkness. Regina knows her magic is tainted, and will always be, but with a mix of light and shes ok with that but Emma? Emma magic is pure and Regina wants(needs really) to protect Emma from darkness. And when she thinks everything will be ok what happens? Emma takes the foulest magic willing. To protect Regina from the dark magic. To give Regina a happy ending. She not only feels her heart breaking because Emma saved her.TBH she shouldnt be surprised. Emma does that since she was just Madam Mayor. Shes grieving Emma’s heart. Shes grieving because she failed to do the only thing she could for the woman she loved, lately. Keep her from Darkness. And THAT is what going to weight. When she keeps awake nights on end trying to find a way to make Emma not the Dark one anymore. She feels like she already failed her mission. But she is Regina fucking Mills and of Emma thinks she’s going to pull a stunt like that and Regina not try to make it right, she is wrong. Besides Emma made a promise of her happy ending. And there is no Happy ending without Emma. So Dark One you just wait. Savior Regina will help you. Just like Savior Emma helped a certain evil queen. It comes to a full circle. Both with dark and light in the end. Both Savior and Evil. Because then they will be ready to conquer. Together