Normally, Akechi is very good at keeping a lid on his reactions around Shido. He's had years of practice, after all. But that was all before - before he knew what Shido really thought of him, before he know how shortsighted he'd been, before he'd died at the hands of a twisted but far too accurate replica of himself that sprung from Shido's mind.

The shock could be explained away as nothing more than surprise, maybe, but there's no hiding the way the tension builds in his frame. If he thought he was cold before, it's nothing compared to how he feels now. He should have stayed outside. He's seized by the urge to actually turn around and walk right back out, and if turning his back on Shido wasn't the dumbest possible course of action in the moment he might have actually done it.

"Shido." No honorifics this time, just a tone that's not quite calm but falls short of unhinged. It's just-- strained. And sure, he's just spent the past hour literally running from monsters, but the intensity in his expression isn't directed outside. "I see you didn't make it inside on time." Good.

... Though it would probably have more of an impact if Akechi wasn't still shivering and having to clench his teeth to keep them from chattering. He's noticed plenty of little details - Shido's injuries old and new, the odd look in his eyes, the implication in his words, the rising temperature - but right now the first and the last are the only parts he's grateful for.