Well, I'm not exactly what you call a normal Servant. I wasn't called from the Throne of Heroes or anything like any of you guys are. But you ask why I have Archer's powers, so I guess I'll answer simply: inside of me in the Archer Class Card, which allows me to Install the abilities of that class. It just so happens to be of the man you speak of.

[ She knows his True Name now, after seeing Miyu's brother. ]

Is that all you wanted to ask? Kuro-sensei can't be here all day.