How to Fake a Shooting in a Comedy Club

Two comedians had a roast battle, which is basically just two guys saying a bunch of mean but funny stuff about each other in front of the audience. The way the club is set up, there's no backstage or whatever so the comedians just sit at the bar in a little closed off area until they're ready to do their sense. Both people were banned from performing there and I think the fake shooter actually got a visit from the cops afterward for inciting a panic.