The question was whether or not he went to the car in question in order to retrieve a firearm.
Which is why the officer attempted to stop the car.
Furthermore, these men were shot a block away from the club, clearly having no intention of engaging in illegal activity at the club or having committed any crime while at the club.
They were shot a few feet from the club. And it doesn't matter whether they were inside the club or not. Do the police have no authority outside of the club? Is the club magical?
Beyond that, the undercovers had not alerted the other police in the neighborhood that they were about to make a bust or had probable cause for an arrest.
They have no responsibility to alert any other officers if they are making an arrest.
They were operating as police officers in their own jurisdiction.
And they weren't about to make a bust. They were about to stop a car and question its passengers.
Having already demolished your previous post, this one isn't worthwhile.