Hugh pretty much covered it. Rule #1 of gun safety is, "There is no such thing as an unloaded gun, when it comes to pointing one at people". Or more correctly, "Treat all guns as if they have one in the chamber and a flaky firing pin".
And why not? 999 times out of 1000 they work as they are supposed to, (at least), but there is NO REASON to point a gun at someone, (or yourself), unless you are ready to shoot them. Aside from everything else, it's just the height of bad manners and stupidity! Whenever some dip***** points an "unloaded" gun at me, even for an instant, I want to knock them into next week.
Try to imagine the reason why this guy was pointing it at his leg; to catch the bullet that might come out so as not to damage the floor?