Regina: This is my battle to fight and it has been ever since I tried to destroy my dark side up on that rooftop in New York.
Snow: You can't do this yourself. Emma's right.
Regina: I have to. If I don't, this won't just end with Robin getting hurt. She'll hurt everyone I care about. All of you. And I can't let that happen. The Evil Queen is going to get what she wants. Our fight ends today.