Jack, rapidly collecting his own sleep-fuzzy thoughts, had figured as much. During the lull in explanation, the Captain puts a hand on the somewhat-wilty Doctor's shoulder. "I'm not leaving." Hey, they've gone over this already, haven't they? No way in hell he's letting the Doctor attempt this on his own.

"I'm got ... a vortex manipulator," he offers after a stilted pause, tilting his head to indicate the leather wristband. "Might need a little tweaked, but I've modded it for Nexus travel."