He didn't move when Jack did, but there was a flash of something hot, and steely in his eyes, even while he was returning that grin. Not challenge, but a warning echoed in the super soft growl at the back of his throat, and coil of tension in his muscles.
There was not a single solitary thing threatening about it. It wasn't aggressive, it was defensive and preemptive. Fight or flight and fleeing was better than fighting, by a whole hell of a lot, as far as he was concerned. At least right now.
Even that faded, eased off and banked when Jack stayed down and at eye level with him.
"We've got no way of knowing if we're from the same universe," he said, but it wasn't a challenge or a dismissal. It was the opening. "Tell me what happened to you."