LOL.. maybe he doesn’t realize he is cross- dominant. The only time I use my left hand dominantly is when I shoot. I am a right handed, left eye dominant. Rifles and bows left handed.. large caliber pistols are another story. Took me a couple of years to figure out why I struggled with marksmanship. Good observation on your part, though.
It was easy...I’ve been bow hunting in E Tennessee for for 50 years....*L*
How does one determine which eye is dominant?
Are you using a Weaver stance? Keep both eyes open and try the issosceles.