Charlie focuses in aggressively on Arthur's voice, now that he realises he's in trouble -- re-realises, actually, since there was definitely a point before he fully iced over that he knew shit was getting bad fast. Everything hurts and spins like he has the mother of all flus, but as lucidity slowly returns he's leaning into the discomfort rather than away from it, because away is into cold and death.

He's got the dazed-but-overfocused look of someone who's been up too long and is fighting it, and he's shaking but less badly, and he's looking from one of Arthur's eyes to the other and back again, a visible question on his face.

"You're lookin' at me." His voice is a bit more distinct as well.