Evidently there is something about shooting for score, perhaps in front of other people, that makes you spend a part of your capacity to focus on a future event: the outcome, rather than focusing 100% on the present: drawing, aiming, and shooting your bow. You can't hit anything in the future; only the present.
Saying that is the easy part, although it is true. Every good athlete knows he has to play in the present. Actually doing that is a never ending challenge.