No, I haven't been field hunting, so that's why I'm asking how it happened.
Now,,, and I have been in a situation, the height of the bird target MAY be at an alititude whereby a fellow associate hunter may be in in the MOA. I've had many rounds shot over my head. Is this a good situation? No. But it is part of field hunting.
I am certain, based upon Cheney's WY hunting background, that he was not "ill-trained." The man has been hunting longer than I have been alive.
As for accidents? Take a look at the number of automobile accidents, versus hunting accidents.