The actor in question likes the smell of his own farts so much that he started to believe he really was the bad ass he acted in his movies. But he’s a joke, really. And lazy. This scene in particular demonstrates this. It isn’t so much that it isn’t braced, but how casually it is swapped in a supposed dangerous situation. You simply wouldn’t handle a real weapon that way. If he deliberately leaned into the lameness for the yucks that would be one thing. But, no. He’s serious. And that makes it really funny.