The old spit V with the uber boost and the 240 cannon rounds.Oh wait, actually, that was awesome...
Kill stealing. Shot a guys wing off and some guy swoops in and does more damage before the plane hits the ground.
Remember when you had a 1 v 1 and you both shot each other down with a kill recorded for both of you. Now it's a race to the ground with the loser getting the kill and some sap nearby who never fired a shot getting a proxie.
P-61B...oh wait that never happened.