Something in Zack's tone leaves Cloud feeling uneasy for a completely different reason than... well, than everything else that's going on right now. Frowning, and the earlier attempt at brushing things off, if not outright levity, gone now, Cloud reaches out. Hesitating before his fingers brush against Zack's elbow, his hand settles there for a brief moment.

"... Zack?" Dropping his hand and looking out over the same surroundings Zack is, Cloud suddenly feels like he's missing something. Or they're having two conversations, but he doesn't know how to ask about that. So he falls back to what Zack's saying, which... well, it is a response to what he said, after all.

"... yeah. It's... I don't get how. But we didn't have an extra moon before." And their moon had certainly not been as large as these two were.