He noticed the grit of teeth, and there's something in his smile that says he noticed it, but he's willing to allow it given that clearly something is amiss. He nods to Krem's assertion about him; yes, he's known he was a Guide, and he'd noticed that Krem was also a Sentinel, but his expression turns hard as he mentions the friend in need.

"Then we should be walking. Or- where is he? Or she, as the case may be."