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When you sneak behind someone and hold the target button the white trianlges appear on your enemy. When you let go of the button you execute the kill. Well what you have to do is hold the square or cross button down longer so that the white tranlges change colour to yellow and then to red. so when you lock on to the enemy hold down the square button until the white trangles target change to yellow or red.
These are the different kill levels with red being the most gruesome.