Just feel like letting you know the way 'Blackshot' works for Marcino is that he can pick an object that can be considered 'throw able' or 'a projectile' and use can use his mana to project it like a manually controlled arrow. It has an upper weight limit. The closest thing I can compare it to is say Yondu's arrow from Guardians of the Galaxy from marvel. Except less piercing. Its more effective with a bow but he can also use it manually. Its one of his advance class skills as a sniper.