Never run when you're scared. Rule 7.

“River Song: Use the stabilisers! The Doctor: It doesn't have stabilisers! River…”

“The Doctor: Just had a fall. All the way down there, right to the library. Heck…”

“[The Doctor, Capt. Jack and Rose are cornered by the empty children.]The Doctor…”

“The Doctor: Amazing. Nancy: What is? The Doctor: 1941. Right now, not very far …”