This story smells. If there was a threat of a gun why did the police wait? Why not take them down outside the club? Waiting for them to get into an escape vehicle or gain access to the weapon first makes no sense.
True enough, and the perps were in the car and they saw an undercover cop with a gun...I bet they had no idea it was a cop...mistaken identity..they thought it was a rival gang member or something...too bad for them.
The club has a metal detector on the door (nothing says "class" like a metal detector. The officers were undercover, so they were not carrying. One of Bell's group was heard saying he was going to "get his gun," which he had presumably smuggled in. At wich point the officer called for backup. The car was parked out on the street. The victims got into the car. The cop put his foot on the car, and showed his badge, telling them to get out of the car. Bell tried to run him over, causing lacerations to the officer's leg. Thus, Bell was assaulting the officer with a deadly weapon. The other officers knew there was a gun invovled, and assumed that the shots that passed through the car were coming from the car.
Nothing good happens at 3:30AM.