[He's avoided Kirei for years. It would be safer, he thought, to just stay as far away as possible.

But that was before he found out Shirou had gotten involved. Before Kirei came to their home in search of him, invited by his own stupid, trusting little brother.

Now he's decided it's best to take care of Kirei once and for all. Thus here he is at the church, sneaking up to the back door with gun in hand. He's had no sign that Kirei knows he's coming, so he hopes that when he kicks in the door he'll find a surprised priest that he can shoot and run.]