Nine Lives Works is not Herakles' bow. It is merely a skill that was used to annihilate the regenerating hydra. It can actually be used by any weapon Herakles could wield, and Shirou used it with a replica of the stone sword, nothing close to a bow.
It is very likely that EMIYA's archer style doesn't bode too well with Herakles' skill, due to the fact EMIYA focus on short lived ammo, so attacking 8 points at the same time with a single NP wouldn't be really possible for him.
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