I see more urban prone and offline attacks like this everyday in trainjng classes.
What most people don’t realize is like a wall asphalt and concrete on streets and the sheet steel on hoods funnel bullets on much of the same manner.
In the field I’ve seen near misses get funneled under vehicles. If you are in this position behind a tire or not or in urban prone you are exposing your femoral on both sides or your face in the case of urban prone.
This is old knowledge look at this FBI training film.
Worse… You are not only exposing yourself to getting shot in nasty, always fatal, locations in your body, but unless you are very good with your weapon chances are you will miss your target.