Ideally you'd arrest the guy with the pistol, or shoot him. Unfortunately he's also strapped with a suicide vest with enough explosive to take everyone in the

Ideally you'd arrest the guy with the pistol, or shoot him. Unfortunately he's also strapped with a suicide vest with enough explosive to take everyone in the room out, which he has threatened to trigger if anyone steps in. So you throw the underdog the pistol and grab the madman's wallet