Kids are stupid, far and away mostly boys. One shot then handed gun to the other.
Most likely "betcha can't hit that tractor".
Just a horrific tragedy for all, mostly the poor 62 fellow bush hogging and family and kid's families. One stupid thing causes a life changing (and ending for one's) life.
As kids we were taught assume every gun is loaded, never point one at anything you don't intend to kill.
Then my brother and I would shoot at each other with pellet guns because we were stupid kids.
In my wife's neighborhood kids had war games using BB & pellet guns, bow & arrows, knives, rocks, etc. One boy lost an eye.
Our neighborhood a boy lost most of one hand making nitro glycerin.
Most of us were lucky.
Kids are stupid.