ORIGINAL: Bowtech Defender
When he is blind bail shooting have someone other than him trigger the release while he is holding his form. After doing this he will know what a surprise release feels like. He can also do this with his eyes open and focusing on the target when someone else triggers his release. Once he has done this for awhile he can the use his finger and will not have that urge to "punch" the trigger.
that sounds like a good idea... i think that would acually work...