Probably yell at Kirei to stay the fuck away from Shirou after that. :"D HE'S NOT YOUR SON ANYMORE SCREW OFF SO WE CAN TAKE CARE OF HIM. It'd be good for Shirou to be able to progress, but it'd hurt him a lot and Byakuya wouldn't want to see Kirei fuck with him any more than necessary. :( He'd be too afraid to stand up for long though.

How has the current Emiya stuff affected the way Shirou sees Byakuya? HAS IT AT ALL?