It's been told time and time again the the public forums is NOT the place to post allegations of 'fishy' situations.
I don’t see where the OP made any allegations, do you?
i was 
at 85 on the deck in a f4u4 at 500mph and get shot down by brewster at 500mph the thing was 800 away i dont what happened 
I do see where the OP failed to communicate because of poor sentence structure and I think we are all assuming that he meant to say “I don’t know what happened” but I don’t see anywhere in is post where he made allegations of anything.
800nate, consider this:
You are screaming along at 500mph, 85ft AGL. Someone at 500 ft sees you, you don’t see him. He anticipates your route of flight, and takes the necessary action to position himself on your six as the result of a Split “S” with a top speed of 300mph. His timeing is such that he is able to start firing at you at his closest proximal distance which may have been 200 feet and he continued firing at you while your superior speed opened the distance, however, the time it took you to open the distance to 800 ft, he opened you up with all that lead. Also, you being in a flat line of flight, means that your aircraft was continuing to slow down, your speed was dropping to whatever the top speed is of the F4u4 at sea level with WEP.
