[Nodding a little, something in his expression softening-- although the concern remains, of course. Will likely remain until he's utterly certain that Keith's okay. He knows he doesn't have to dismiss the thanks, just as Keith knows he doesn't have to say it-- he accepts it without comment, even as they both know Shiro would do this no matter what.]
Yeah. Good idea. [...] Sorry I can't give you something more comfortable.
[At least, he figures, he'll have time to get other supplies-- medicine, bandages, some water, maybe some food-- while he rests.]
[... Lifts his hand again, brushing back his hair one last time-- no reason for it utter than to indulge in the touch, to reassure Keith somehow.]
If you need anything, just tell me. I won't be far.