He's more upset about breakfast, having gotten his hopes up.
But there's something - steadying, or something, he can't identify the feeling - about the idea that Atsinni would do something for his sake that wasn't trivial. It doesn't mean existence isn't miserable. It doesn't mean either of them wouldn't damn the other if it seemed like a good idea. It doesn't mean either of them has a plan, or that they're working together, or that it will ever happen again. It just means that one day someone chose to sacrifice something for him, and for no particular reason that means he finds it easy to focus on the thinking he needs to get done.
Also it means that if he were confident in his decisionmaking, and confident Atsinni hadn't planned it that way on purpose, and confident it wouldn't damn thousands of other people, and confident that for some reason exactly one of the two of them would have to go to Hell and suffer forever, and if it were his choice who - exactly none of which conditions obtain - he'd go himself, and it wouldn't be a hard choice.
So anyway. Three hours of embroidery class, which is sort of nice to watch and doesn't take much attention to enjoy in the background while thinking. And how do you get to be confident of things? How do you come up with a well-founded idea of some things as more likely than others, if you can't be certain? Of course Atsinni behaving that way could just be a plan to win his loyalty and not actual kindness - a thought that hurts very badly - but surely it means something, even if the thing it means is that Atsinni wants his loyalty, even if the thing it means is that Atsinni either wants his loyalty or cares about him - it seems like it's more likely to mean one of those things than to mean that Atsinni is really fascinated with spiders, right? Only why? Is that just an untrustworthy feeling or is there something to it?
The thing is that if it meant Atsinni were really fascinated with spiders, that would raise some questions, like "how do you get from being really fascinated with spiders to skipping dinner?" Whereas if it means that Atsinni likes him, it doesn't raise questions like that. Is there a way to be sure he's not missing questions? What exactly defines the category of question he's concerned with? It feels like in one case all the steps that would lead from the theory to the observation are clear, but in the other he doesn't see how the theory leads to the observation at all. But doesn't that say more about his imagination? Couldn't there be an explanation that he just isn't aware of? What if which sorts of connections between theories and observations he can easily think of has to do with what he was taught by demons trying to make him wrong about things? Is there something that doesn't rely on his poisoned intuition or judgment, something mathlike in its objectivity?
If Atsinni was nice to him because Atsinni is really fascinated with spiders - what, does Atsinni want to ask him later to ask another slave questions about spiders while they're at the Pool? Maybe there's a slave who studied them before being captured? Something else could happen to be true that, in addition to Atsinni really liking spiders, would explain Atsinni being kind. (He's going to feel so stupid if Atsinni actually just wasn't in the mood - another simple explanation - but that's not the point.) Atsinni liking him would explain it without needing any extra facts - is that true? What if Atsinni was going to Hell and didn't want him to grieve and decided to be an asshole to achieve that? Okay, additional facts do determine whether Atsinni liking him leads to Atsinni being kind to him. That feels somehow weirder and less default, as though there's something default about being nice to people you like that's not default about being nice to people you don't like when you're fascinated with spiders, but maybe that's just poisoned intuition. If there were a quantifiable amount of expectedness and he could be confident about that then he can see how he could get somewhere from there without relying on poisoned intuition about how to change his mind when things happen. But that's a big if, that he can basically only see how to apply to extremely simple and objective things like how many fingers he subjectively experiences himself as having.
Well, but aside from that - he's confused and mostly feels grim and afraid, but he'd say he's okay for the first time he can remember. (He'd say so because he doesn't have experience with a wide enough range of possible amounts of okayness to know what being okay even means, but still.)