When I learned to use a circular saw, the guy who showed me pointed to the saw guard- it was an old Crasftman that said "1-1/4 horsepower" on it.
He said to me "Is there ANY horse that you want to eff with?", paused for effect "RESPECT this saw!"
When I learned to shoot, the guy who showed me broke open the cylinder and pointed to the etch on the top strap. "You see that?" he asked. "This gun is made of STEEL. What's your hand made of?"
I remember one of the matches I shot, there was a guy with a 357 snubbie.
One stage you had to fire in a small opening with cardboard on both sides.
The blasts from the cylinder gap was destroying and burning the cardboard on every shot.
After seeing that, I've been very careful with my grip while shooting revolvers.
Yeah, I don't remember exactly what the "myth" was but they created a simulated hand using chicken wings as fingers. Then they tied it around the gun as if you were grasping it by the cylinder. Blew the $#!+ out of it.
I dunno. The muzzle blast out of the barrel is what is mostly destroying the paper. I know there's always a need to warn the lowest common denominator. I have to see someone injure themselves by doing what he's describing. And I've seen some dumb shooters.
I used to shoot revolvers next to dozens of people shooting only revolvers - all at the same time. I never saw anyone get burned by their revolver, much less someone effected by one next to them, but they were mostly .38's.....
Watch some of the videos showing the S&W 500 firing. They shred carrots in one of them simulating fingers. Watching that really made me notice where my hands where while shooting the X frame guns I own.