The call is the catalyst. The cops are the gullible, hyper-agressive actors that turn what should be a simple matter of communication into the 'justified' killing of an innocent.
I agree. In the video I saw the cops killed the person from it seemed like 100 yards away. He had opened the door and cops thought he was reaching for his gun. But the cops were or should have been behind a car or bulletproof thingy, no need to look for the lamest excuse to kill someone.