"Jack." The Doctor's voice was soft, gentle, just as his hand when he put it on Jack's shoulder once he was close enough. "It's alright. No harm done, he just had to try." He turned to walk inside the TARDIS, already starting her up while he still waited for the other two to follow behind him.

He hadn't been worried about John killing him, not really. For one thing, he was still waiting for four knocks. For another, for better or worse, John cared what Jack thought of him. And some things, as Jack's anger showed, could be a permanent deal breaker.

"Where do you want me to take you?"