Instant death

Instant death: R,R,Y,B The hardest to pull off, but also the quickest way to make someone die with a battle rifle. Stand in front of them and aim at his/her head, then by pressing R,R,Y,B quickly you will first fire one shot, then switch, melee and fire the second shot. The melee is to be pressed when you see the secondary weapon model. You could use the B,X,R, but with this trick you will always do damage, because of the first shot and on top of that you can do it with a not-full clip. Note - You do not want to run forward while getting in range for the melee, because then you will have the second shot hitting you in the back of your head.