Animenewsnetwork - So Caster and Souichirou are finally out of the game. It's been coming for a while. Their story has dominated this show since around episode six, and it's time for them to move out of the way for the final showdown. Archer, jerkwad that he is, was a double traitor, working against both Rin and Caster for his own interests; specifically, he's interested in murdering Shirou. I won't say Archer's identity until it's stated in-show, but it's gotten pretty obvious by now. Shirou and Rin have finally gotten it, and it's clearly tied into his desire to murder the kid. The reveal will come soon.