With NO shooter that guy will just sit on YOUR 6 and spray like a mother until he kills your target.
You wouldnt like to see a trail of 8 cons behind you, each from d300 to d800 firing like crazy at you. The wall of lead would only hit YOU and not them. Now wouldnt that be nice?
However, if HTC can code it, I think the killshooter should be disabled if the planes are inside d500 of each other, and enabled if they are beyond d500.
Example: Green1 is on the tail of red1. Distance is d400. Green1 is shooting away and missing. Then out of the blue comes green2, sits on the tail of green1 at a distance of d600 from red1.. and starts shooting. One of those shots hits green1. Green2 gets hit by killshooter.
However, if green2 jumps in FRONT of green1 to steal the kill and flies into the bullet path of green1, then green2 gets the damage just as if he was being shot at by an enemy. Why? It HIS fault he's flying into green1's guns when green1 is so close to your target.
Now, this would pose the only problem of people getting behind cons when both green's are inside d500.
Well, I dont know about you, but if I get inside d500 and I dont manage to kill the con before someone ELSE closes in on the con and shoots it down, i'd say I had my fair chance at getting the kill. If the other guy is dumb enough to fly in front of you he dies. If he gets behind you and still inside d500 of the con and fires away hitting you, then it would be MY fault since its taking so damn long.
From my experience, very few people have actually sat on my 6, inside d500 of my con and fired away with or without killshooter.
For this, people should LOSE 2 perks every time they shoot down a friendly plane.