[Which is horribly appropriate given his actual life in general. She knows her tension isn't hidden, even if she does her best. In this situation it's impossible for her to keep it completely so. Between the sickly aura practically radiating off Avenger, his resemblance to Shirou, and how surreal it is to see even someone who resembles Shirou to slouch and speak in such a manner is unnerving.

Ruana could only hope to mess with her mind as much as speaking with Avenger does for her. Nothing Ruana ever did drove Arturia to want to erase her memory simply because she wanted some form of peace for once in her long existence.]

So, when you take on Shirou's face, for all intents and purposes you are Shirou? Are you even aware of yourself at all when that happens?

[It makes sense, in a way. Not that Arturia realizes Avenger is essentially nothingness incarnate, but because of how close he was to mimicking Shirou. Too close, in fact. The slight differences she could still attribute to the Shirou who reached the Grail being of another world than hers.]