Watching that video, I can't believe how many times I said "obviously."
Obviously, I wasn't paying much attention. In my defense, I just braced a camera on a book, pointed it down the hallway, started talking, edited in the open and closing slides, and there we go....
In general, just make sure the gun (of any type, people are notoriously bad with pistols in this fashion, and it gets them DQed in matches) is pointed DOWNRANGE when you open the bag/box, and then don't sweep yourself as you pull the gun out or put it back, and you'll be fine.