He believes a hero must save everyone and refuses to align with Caster because she uses innocent people as mana sources.
It is revealed that Caster has broken the standard rules of the Holy Grail War by summoning her own Servant, Assassin , to guard the Ryuudou Temple.
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The episode heavily hints at a deeper connection between Archer and Shirou. Viewers note similarities in their dialogue, body shape, and Archer's "pure" sword technique, which Saber notes is remarkably familiar.