Shirou has a bow that is near identical to Archer's own bow drawn though it's a bit smaller to account for the height difference between the two of them, though his arrows seem to just bounce off! Of course, the projectiles he's using are likely just lower ranked mystic codes, he doesn't seem to have started to use Noble Phantasm arrows just yet, maybe he's worried about his lack of magical energy despite the mana rich surroundings?

Part 19