He's got a major case of target panic. Its not fun. It will take work to get over.

first is to get a large target without any dots or markings on it.
Stand about 5 yards away, and have him draw, hold, and aim with his eyes closed. Then release. Keeping the eyes closed.

Do this for a week or so.

Then open eyes and begin shooting at the blank bale.

Do this for another week.

Then gradually move farther back.

You basicaly have to retrain yourself to shoot a bow. A backtension release will help keep the target panic away in the offseason.