ASHILDR: Do you ever think or care what happens after you’ve flown away? I live in the world you leave behind, because you abandoned me to it.

DOCTOR: Why should I be responsible for you?

ASHILDR: You made me immortal.

DOCTOR: I saved your life. I didn’t know that your heart would rust because I kept it beating. I didn’t think your conscience would need renewing, that the well of human kindness would run dry. I just wanted to save a terrified young woman’s life.