In that YouTube video it looked like the officer(?) was standing outside the driver’s side door, leaning against the wall looking almost casual. The other guy is standing by the passenger side and they appear to be chatting or something. The second guy suddenly drops the first guy with mo warning.
Couldn’t see the weapon clearly, heard a shot. The victim clealy wasn’t expecting it. Then the video goes blurry as another police car arrives and there is a whole mess of rapid semi-auto gunshots on the audio.
Correction: He got out of the car (I mistook a shadow). I think he knew. That video is really hard to make out