[ Killing Shirou is the last thing she wants to do. But she cannot abide by a man who would sacrifice his ideals like he has done. It makes her feel like she should second guess her own love for her country, something that she doesn't want to do. She doesn't want to believe she was completely mistaken in her faith in Shirou. ]

You have done none of things where I am from, Shirou. [ She follows his roll, but does not strike right away, pointing her sword at him. ]

But you have discarded your ideals! You have become a different man than I had come to admire and respect! I will make you see the error in your ways, even if it must be by force. You would have wanted that.

I followed you and Rin to the Temple. I watched you fight impossible odds, to prove that your ideals were just. And I... [ Fell in love with you? That's basically it, but she can't say it, instead striking at him again with Excalibur. ]