Just mattv2099 with a couple more videos of things you really oughtn’t do with a Glock, or for that matter, any firearm. He does it so you don’t have to.
One of the more common mistakes I see new shooters do is hold a semi-automatic gun with their thumbs locked over each other; I can see how this is safer — or at least, “safer” than that. But it’s still a little terrifying to watch.
Although for operators operating operationally, holding the slide closed on a suppressed pistol probably has its benefits, and it would be interesting to see if the single-shot method offers better noise suppression.