His smile doesn't waver, but he does seem to fall quiet long enough for her to speak. After all, his intention wasn't to talk over her and from what he remembered about her, there was the feeling of genuine respect and admiration. Mainly for how intelligent she was, but he supposed her ability to wield a sword came into play now too.

He'll tilt his head when she cuts herself off, looking confused for those brief seconds before she continued on a different train of thought. Something that receives an energetic nod, before he's standing up straight again.

"Yeah! That's it." Yamamoto beams, before he's moving a hand to rest against his chin thoughtfully. "Still, it's pretty weird. I feel like I would have never forgotten that stuff normally..."