Jack blinked. he hadn't expected the Doctor to get so nasty, but there it was. Maybe he was just stressed about the situation. Still, he made his position quite clear and Jack was nothing if not a good soldier. He saluted. "Yes sir. Good to go."

To be honest, he didn't trust John much either, but that had been the entirety of their relationship, pretty much. He gave John another apologetic look and a shoulder shrug. What could he do? His hands were tied in a way. Though not in the fun way. That would have to come later.