"So you're a researcher, in a sense," Billy says with a quick nod. He can definitely understand that---observing, poring over information, trying to make connections. "You speak with such authority about many subjects. It makes sense. But there's still one hole..."

He leans back and flicks his gaze up Kaworu's face. "Research can't teach everything. It doesn't teach compassion, or about coping with war trauma---believe me, I've tried. You have some specific experience?"