All of that exaggerating and chest thumping is some kind of a 'bro' bonding ritual, usually confined to males, females have their own chapter. They used to call it "talking smack", but it's it's pretty pervasive among LEO's. Check out some of the body language videos on Youtube. Then watch this video again, see the cops strutting around, justifying everything they did, and you won't really need to hear the audio. This is gang behavior.
Also notice, where are the neighbors with their cameras? It was only 8:30 pm according to the body cams, and there had to be a dozen cars with lights flashing sitting there at the corner, with shouting and noise... Nobody came out to see what the heck? Anyone have additional info, because I'm baffled.