[Notices this, of course, but doesn't draw attention to it for now, hoping the distance will help, forging ahead for them both. But considering how Keith feels it gnawing at him inside too, if only for Shiro's sake... he gets it'd be worse for him, all the more. All they can do is keep going, at least for now, but he watches Shiro in case he might need to stop, in case he looks too overwhelmed at any point.]