Leaving an unattended loaded rifle with a teen supervised by an idiot while mom and friend go downrange is not a recipe for safety muffins. Extra sprinkles to the Idiot “Instructor” for actually stepping in front of the loaded rifle to take a cool pic for the kid.
The Four Rules
-All guns are always loaded.
-Never point the gun at anything you are not willing to destroy.
-Keep your finger off the trigger until your sights are on target.
-Be sure of your target and what is beyond it.
O_O
That would get you banned from every shooting range I know of, including unofficial and private ones.