Got a stern reminder today. Fortunately, no one got shot.
I was quickly checking a rough zero on a scope mounted on a FAL.
I walked down 50 yards and was putting up targets, turned around every so often.
Suddenly, a major asshat walks up to the bench, AR-15 in hand, finger near the trigger, maagazine in the mag well. And now he's monkeying with the charging handle, barrel down range.
Before the rangemaster could reach him, I shouted (as politely as I can as I don't want a ND in my general direction

) "What in the HELL are you doing!? There's someone downrange. Put down that weapon NOW and step behind the line!"
Then he gets mad and yells "Well, o.k. Go ahead and finish what you are doing."
I walk back and said, " No one handles a weapon when someone is downrange. Period."
He says, " I didn't see you ( I'm 6'-4" 245 pounds, I was fifty yards away in bright sunlight, clothes contrasting against target and backstop ) and besides, I KNOW it's unloaded."
I said, " Doesn't matter if it was. People and things get shot with EMPTY weapons.
If you're sure it's empty, put the muzzle to your foot and drop the hammer."
He didn't do it and yes, I was prepared for him to try anyway.
He said he was there to teach his young son......TADA!.......gun safety!!
I finished my business and left. The rangemaster grilled him in a lighter tone on the same points. He was huffy and not man enough to humble humself, admit his mistake and move on. Good role model for his son. Some people don't deserve kids.
And no one else on the range called him on it either.