I am merely a layman, someone who might dabble in physics
Back and to the left, back and to the left, back and to the left, back and to the left.
How are the laws of physics affected when the victim is trussed up in a back brace?
Just to be clear, I agree that on first look, it does look like it came from the front. But when you examine it frame by frame, the spray definitely goes forward. Plus of course, it matches the entry and exit wound to the skull, and the fragments in the car.