I think the man needs to change his story yet again. I can't think of too many handguns that fail the 3 foot drop check. Maybe, just maybe a 1911 that is cocked but not locked could strike the ground just right so it breaks off the hammer's sear, but that's about it.
Even a cocked revolver usually requires the trigger to be fully depressed in order for the hammer to strike the primer. And one doesn't normally carry a cocked revolver in one's waistband.
Lots of revolvers made 60 years ago or longer were not safe to carry wih a round under the hammer. Had a .44 magnum Sauer and Sohn, made in W. Germany that was that way. Old style were dangerous.