He thinks he notices Hisoka moving behind him, and so he turns to check, hands still shoved into his pockets. What he sees isn't what he was expecting at all. An expression like that... Killua can't help but react with one of his own. Sympathetic and shocked.

Hisoka... Hisoka wasn't supposed to be this human. He's spent months in jail now, and he seemed to lose it more each day. Killua had been noticing that as well, and it make him uncomfortable. Of course it did. But this?

He should walk away. Hisoka has only been an ally when it was convenient, right?

But Killua has changed a lot as well, since first meeting Gon, and since first running into Hisoka. He really knows nothing about Hisoka's life, so maybe there was more there that explained a lot of what he acted like. And he, himself, could have ended up the same way, couldn't he?

When he thinks that, he turns the rest of the way around, blinking that earlier expression away. It wouldn't do any good. It might just be awkward for the both of them. So instead, he looks nonchalant and curious, stepping back towards Hisoka. He can't even bring himself to look at him, picking a spot on the ceiling to view instead.

"Ah, actually... You have cards in there, right? Do you play any games?"