Well the story was Brown went for his weapon during the "scuffle", and that's when the first shot went off, while Wilson was still in the cruiser. When people allegedly saw Brown in the cruiser with Wilson's arm around his head, this was probably mid altercation, after Brown had forced Wilson back in. Wilson fought back. Brown may have went for the the weapon... As Wilson went for his own weapon. Cops do this. They put their hand on it and in this situation he would have tried to take it out, and Brown being so close and stupid in that moment may have tried to grab it.
Then shot went off. Then Brown ran. The rest I am not sure about. Maybe Wilson was just in fight or flight, firing at him. Maybe after getting some distance, Brown turned around and did taunt Wilson. Maybe he then charged him, taking Wilson as a softy nervous white dude that wouldn't put him down.
Notice if, Illyria. Nobody on bluelight knows exactly what happened.