Well that.. certainly is a thing. He actually takes a step back from Rosinante because he has no idea what's happening, or what's so funny. If this was Injustice Kuai he'd have some unpleasant Joker comparisons right now..

"Are you all right? Do you.." The rest of what Kuai was going to say vanishes when Rosinante goes silent. He's clearly still laughing up a storm about all this, but now Kuai can't hear it. He's not sure if this is better or worse. "Do you need assistance?"

Maybe he just needs some time to get ahold of himself. Unsure what to do Kuai turns to his lantern, examining the changes. It's definitely nice and red, and it had been blue before. As for the eye thing... Sora has eyes? Of course he has eyes.

He might be waiting there for a while for Rosinante to stop laughing.