When Gil targeted Archer, he couldn't hit Archer's core. Archer went into spirit form and deceived him, faking his death. Even then, it is one of those moments in FSN which doesn't make much sense, considering Archer survived one more day when he was already running low on mana with no master and was mortally injured.
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>Saber using Excalibur
>Shirou vs Gil
>Archer's Smile
It's a 5/5.