Jack kept a close eye on the two of them, half expecting the Master to jump to life at any second and tear out the Doctor's throat with his teeth. Who knew what he was going to do and what he was capable of like this? Jack certainly had no idea, and he wasn't very keen on finding out the hard way. He caught the Doctor's gaze evenly and sighed.

"It might be for the best. I... didn't exactly say anything when I left, so there's a good chance they'll be mad at me." Gwen absolutely would be, and he was certain that Owen would have a few choice things to say as well. He was still figuring out Ianto, but Tosh was fine without him.