DOCTOR: Most armies would notice that they were fighting smoke and shadows, but not this lot, Ruby. You know why? Cos they have faith.

MUNDY: Shut up.

DOCTOR: Faith. The magic word that keeps you never having to think for yourself. Just surrender, Mundy. Just stop, and it's all over.

MUNDY: Prove it.

DOCTOR: What, seriously? Now you need proof, faith gyal?