"Says the man who just grew back half his body," the Doctor pointed out. "I fail too many of them."

He'd failed Jack, too. Which is how they ended up here. Tried to create a paradox he should never have had to need, and then failed at even doing that.

"Speaking of which, I think the sun's up." He winced as he pulled himself to his feet and peered out the mouth of the cave. Large, slimy insects crawled along the outside, but they didn't peer in or bother them, as though they were held back by a forcefield.

"Think you can make it?"