BEN: What’s the trouble, Doctor?

DOCTOR: Well, I’m afraid, my boy, we can’t leave at the moment.

POLLY: What? But why not?

DOCTOR: Yes, well I know it’s really difficult for both you to understand, but I’m under moral obligation.

BEN: Well, about what? We’ve got no ties here.

DOCTOR: No, but it’s this village. I feel that I might be responsible for it’s destruction...