quadraginta
Becoming Beth
It's pretty easy to imagine Wilson pulling alongside the two kids, opening his door into them to get out, then Brown shoving it closed, hitting his face (which would explain why Wilson could have been enraged enough to shoot Brown). It's also been the stories from all of the witnesses that they were "tussling" in the window of the car. Either scenario is consistent with what witnesses say.
It could also explain why his poor marksmanship was only four or five times as good as the national average for cops.