[That mention of Subaru's eye gets a noticeable reaction from Kamui -- a sudden twitch of his fingers and the color draining from his face. he may not dwell on it anymore, and it may have been Subaru's wish, but Kamui is still wracked with guilt over what happened. In response all he offers is a quiet:] He lost it in a fight.
[Right, Subaru's sister. The major difference, as near as he can tell, and something he's willing to share with his other self. He can't imagine hearing that his brother isn't actually his brother in another world is anything other than at least a little upsetting, so he's willing to share. Kamui doesn't mean to speak in the past tense, but it happens anyway. He raises his voice back to a normal level.] Yes. Her name was Hokuto.