VICKI: That was no risk! I noted, observed, collated, concluded... and then I threw the rock

DOCTOR: Compassion, it's rude to criticise your host's planetary tectonics.

NARRATION: The Doctor had looked after Fitz - had thought he was looking after Fitz for years now. Fitz might not be the real Fitz anymore, but that was irrelevant. He had a purpose in life now. He was going to look after the Doctor. Whatever it took.

DOCTOR: Mm. I remember a place where the night sky was burnt orange and the tree leaves were silver. Beautiful. I would lie on the hillside gazing at the stars and putting the world to rights.