Arthur, who has no earthly idea that Nobunaga is oblivious to his blindness, takes his comment as an empty platitude, and puts all the weight on it that an empty platitude deserves.

"Of course," he says, to all of it, and while he doesn't say it rudely, his voice doesn't rise much above the current Nobunaga level of heartfelt raw emotion. You could almost describe it as avoidant. "And... and as friends, you understand if I-I, if I want to be alone for a while."

Alone. In his cabin. Which has no other people in it. No-one but him.

"Just how is Klaus so hard to imitate anyway? I don't think we've met."