"Yes, yes, still working to catch my breath," the Doctor said with a mock exasperation. His lungs felt clearer, but he wasn't happy with how tight his muscles still felt.

He could see light at the mouth of the cave. Daylight. And it wouldn't last too long. He turned back to Jack, and then struggled to get to his feet.

"We haven't got much time. We need to get to that Tower and we need to get there before the next nightfall. The last thing I want to do is actually sleep here."

He had enough nightmares about Gallifrey without this trip.