Sometimes you'll engage on plane that doesn't have any damage and flies like that too, but somewhere before, someone in a P-51 has unloaded some shots on him and P-51 is like 25 miles away, then you'll fry the enemy and you will receive assist..
Who did the kill?
Seems like those .50s are great tag guns, as my observation.
Usually when your kill credits on plane with all parts still there goes for other guy, instead of you, the real killer, that other guy has .50 caliber guns. (if you're having some single 20mm plane)
Maybe we get some fixed system for this?
Like credit the player who shoots some critical parts off (or have some range checker, is the guy with most 'damage points' still around)