Lucifer: I know I promised to help end your curse, but I'm afraid we need to dissolve our unholy alliance.
Cain: Why?
Lucifer: The risk is too great. I mean, I don't mind putting myself in danger, but the Detective? If she had died, it would have been my fault.
Cain: But you're the Devil. You always keep your word.
Lucifer: I do. I hope you understand how difficult a decision this was, and yet, probably the easiest I've ever made.