The contact takes him off guard, or at least, something close enough to it. There's a flicker of uncertainty in his expression, a tension that suggests he wasn't expecting to be touched. Nothing personal; he just doesn't expect that level of familiarity unless it's from very specific people.

He relaxes quick.

He tosses Jim a nod, and then he's heading out. Much as he'd like to stick around, he's got his own ground to cover.