Collisions don't happen when one object is traveling away from another. It's simple physics.

If you strike a person with your car, it's legally your fault. This is why people can't run over stupid protestors that shut down the street.

If your friend doesn't want you to run over a person, they don't yell "Drive baby, drive!" when a cop steps in front of the car.

If you don't want to get shot, don't send your car barreling towards an armed person.