Ah, Ha ! I've figured it out ! ,,, when you are ahead of your hunter and he fires, the bullets are in effect chasing you down, and as your a/c is advancing under power the bullets are actually losing energy due to drag and such and slowing down, so as the bullets pass you and slow down to a speed lower than your a/c's you are actually running into the bullets in front of your a/c that have slowed to below your a/c's speed ! hence comes forth the dredded whine '..he got my fuggin radiator from ded 6 ! #$@^^^#$oscar%@&%$ !!!!! '
..see if you apply basic physics principles, anything can be explained !