"Oh, I think you'll love that part." With that the Doctor grasped Billy's hand and pulled him along as he headed back the way they'd come. There wasn't any time to waste, after all, not with that many bodies on the ground that could still be saved. Not that he ever had much time to waste, ironically enough.

When they reached the TARDIS he let go of Billy and walked straight inside, shrugging out off his coat and hanging it over the usual place. While he entered the coordinates he kept an eye on the door. He definitely didn't want to miss Billy's reaction.