Ritsu notices that lack of a spark in Yamamoto's eyes, and he knits his brows slightly. This sudden plague has clearly taken a considerable mental toll on Yamamoto - in a way that Ritsu doubts was merely caused by exhaustion from fighting for one's life. It's commendable, in a sense, that Yamamoto still has it in him to show concern for another human being, given the state he's in.

"I'm fine. I haven't been bitten." He knows the state of his arms probably looks alarming - not to mention the large thorn sticking right out of his chest where his heart should be - so he briefly gestures to it with a hand. "This will heal. It's not from them."

But if Yamamoto is so concerned about whether he's been bitten, specifically... Ritsu wonders just what on earth will happen if one bites him. Infection? Disease? It can't be that they're the bonafide type that turns you into one of them if they bite you, could it...? That sort of thing only exists in trashy movies and low caliber novels, after all.

But then, if that is the case, it would explain why there are so many of them - and why Yamamoto looks so emotionally worn down. How many of these zombies are former inhabitants of the Anchor? How many are people Yamamoto once knew?