Nardole and The Doctor in “Extremis”

So, you're blind and you don't want your enemies to know. I get it. But why does it have to be a secret from Bill?

Because I don't like being worried about. Around me, people should be worried about themselves.

Yeah. Shall I tell you the real reason?

No.

Because the moment you tell Bill, it becomes real, and then you might actually have to deal with it.

Good point. Well made. Definitely not telling her now.

You're an idiot.

Everyone knows that.