"Actually, um," Daniel hesitates because he doesn't know how Seth is going to react to this, but forges ahead regardless, "would it be possible to just - check him over, make sure he's okay? Just to be on the safe side."

Spending a couple months in the rebels' hands can't have been very good for him in any case. And Daniel is worried, because Seth is acting too quiet, because one of the first things he said was a completely unwarranted apology, because his hands are shaking and he doesn't look steady on his feet, and Daniel is worried.