With an open mind, look at it this way. Forget about the ND for a moment-if the same thing happened and a wall blew down onto a shooter, that would automatically get a reshoot for range equipment failure. Had that happen to me at the 3gun nationals in Vegas years ago when the wind blew a huge netting over the top of me while shooting a stage. Chuck, you were in my squad and probably remember the incident.
So are we saying the shooter is responsible for the gun regardless of what transpired? Try this one then. 3 gun match, shooter does shotgun portion, properly places shotgun in barrel, grabs handgun and starts engaging targets with it. Wind comes up, blows shotgun dump barrel over and shotgun ends up pointing up range. Are you gonna DQ the shooter for passing in front of a loaded gun (10.5.3)?
If I'm on that ARB, I'm hard pressed to allow the DQ. This is a pretty abnormal circumstance. Flame suit on.