"The townspeople who were here before. They seem unaffected." It was just those who didn't belong here, for whatever reason it was that they'd washed up on shore in the first place. Itachi would make that connection easily.

"It's not the same with everyone. Whatever's happening to me, it isn't happening to all the others. Their's are different." Their changes, whatever better term there was for it. "It's not a curse mark. I couldn't find anything like that. Whatever it is, it... infected all of us. Broke my connection to my chakra."

He glanced up at his brother again at that, squinting unnecessarily. "Yours too."