His eyes follow Jack's frown down to the wrench. It occurs to him that they didn't eat anything before they left. He's never been much of a breakfast person, but Jack might have benefited from it.

Or maybe it's the coffee. Caffeine on an empty stomach.

...But the kid splices like a fiend, it's hard to believe caffeine would be enough to cause that.

Still, for lack of anything better to say--

"Little too much coffee there, son?"