Sorry guys. Reguardless of the place the offense is taking place, an assailant brandishing a firearm can be dealt with in one way only. Pointing a gun at one or multiple individuals is proof enough IMO that the person causing the threat is intending to shoot. Wait for the first shot to be fired? Ponder what your response might be if the gun was pointed at you, or someone accross the room, then imagine the reverse. Yell "drop the gun" is only for legal protection, because it will most likely cause the perp to swing it toward you, forcing you to be shot, or shoot.
