I don't know

but I swear those RAF guys must have a death wish. Not only do they aggressively attack even while they look like angry fireballs (its pretty cool seeing a critically damaged plane at night, very easy to spot as well) but they also collide into each other

So far this has happened to me twice- go ahead and let yourself get attacked by 12+ aircraft at a time, and sooner or later two of them will plow right into each other while diving at you from opposite directions.