[Torin]

im pretty sure that archers do not care about HP or possible damage dealing. Thats why they fire at lonely "arrow catchers"
I assume they fire the closest archer possible. Perhaps javelineers are archers too. Im not sure exactly wich are archers.

A commander with a bow (equipped or not) shouldnt be targetted since you cannot fire at commander or attack commander.
But i think that if you position him forwars he will be targetted. Someone does this?