A lot of fine lines to this tragedy I should imagine.
Supposing (for whatever reason) you stand in front of a moving car and shout "Oi I want a word with you" or similar
The driver brakes but still flattens you - clearly an accident
The driver accelerates at you - that's getting towards manslaughter/murder
The driver doesn't react either way ??????
And yes, standing in front of a moving car is never a good idea.