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.
He believes a hero must save everyone and refuses to align with Caster because she uses innocent people as mana sources.
This disagreement leads Archer to literally stab Shirou in the back, attempting to kill him to eliminate what he views as a dangerous, naive ideology. Key Servant Encounters
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