Could someone explain to me how someone who is not Shirou is projecting Archer's soul? I thought the Archer class card giving a bow without arrows made sense, because his items and abilities are all useless for anyone but him. They're all based on using your soul, so only someone with the exact soul as him can use them. Even by copying his soul, Shirou can't get the same results as him, and has quirks like thinking Kanshou and Bakuya are historical items instead of Archer's original creations. Yet here Illya is, using his class card to trace items straight out of his soul.