That's all I can figure.
But why he didn't check for a round in the chamber HIMSELF, and instead, apparently relied upon his partner to check it alone, is what I CAN'T figure.
He may be a "professional" of some type (BS-er, etc.), but it's certainly NOT a professional at handling weapons.
Now one of the steps, racking the slide and pulling the trigger, is controversial. My carry weapon is an XD9, which like the Glock has no manual/external safety.. so like checking division by multiplying, this step ensures the gun has no ability to fire. Repeating is more a function of racking the slide to ensure that I did not somehow chamber another round...
Boring, Redundant, and not at all exciting like T.V. guns.. but it keeps me and mine safe..
This guy broke every one of my rules. He was handed an "unloaded" weapon, and assumed... That's a very stupid assumption.
Raymond