youre right, but i definitly want a system, when you can "prepare" a bit, maybe something like "lasts 3 turns", like phase shields, so you could prepare 3 rounds before? i really like the idea, to have an advantage, when you bring the archer earlier at the battlefield.
and yes, he doesnt produce the arrow, but he shoots it (like rain of arrows with more archers) and it needs some time to reach the target (or hit the target).