Avid pool players (and even some novices) like to call their shots before they make them. It's not enough for them to get the ball in the pocket, they have to call the correct pocket before they make the shot. And of course, in order to win the game, you have to call the pocket before you make the eight ball. This is all well and good for pool. It's a low-stakes, fun game so calling the pockets makes it a little more interesting and exciting.
This is not the case with archery. Archery is already high-stakes and difficult. Under the right circumstances, it can be deadly or at least extremely harmful. King Philip of Macedon found this out the hard way. In a battle, he was shot in the eye and ended up losing the eye. When his men picked up the arrow that had done the damage, written on its shaft was "To Philip's Eye!" It seems that, like in pool, the archer had called his shot before he let the arrow fly. That's one accurate archer.