He watches, dizzy and still seriously considering throwing up, light headed and, if he's honest about it, scared to the point of being near fainting, but he's not going to be honest about it. He's going to keep being Jack, which means bluffing like his life depends on it, not show anything he doesn't want to show, and going to look down at Jack. The other Jack. With his face, and the same borrowed name.

"Two thousand years haven't been good for your sanity, have they?" he asks, and - well, the most obvious tell that he doesn't offer the other man help up. He flops down on the floor. "And you probably want to go take a shower."