The Doctor looked back at Jack's bruised face. Quite a lot of harm could be done in a tight space like this. Though there was really no way around it, they would need sustenance in order to make it the last leg of the journey to the Tower.

He handed half of the block to Jack.

"I have the feeling that we're going to be regretting this later," he said. He broke off a corner of the food , closed his eyes, and popped it into his mouth.

Still tasted like cardboard.