Personally I think that every time you park your car to get out, a small window of opportunity exists for a BG , because you are at a more vulnerable situation than usual and your SA has to be up before you park. I know coming home at night in the country, and parking in the garage my wife and I are vulnerable to someone stepping around the corner behind us just as we are pulling in the garage. As we approach the house our SA is wide open, looking for anything out of place. However, my g27 is in my hand, while my wife is watching from a different view in the car and ready to give me a heads-up while I finish parking.
Your friend was lucky. In our rural environment my wife and I will likely face a BG with lethal intentions.