Instructions
Play until your opponent's "Health" bar is down below 25 percent.
Position your character in front of your opponent.
Hold down the "L2" button on the PlayStation 3 controller.
Tap and release the "L1" button. Your character will execute his "dirty" or "clean" finishing move (depending on the character). With your opponent's health so low, the move will likely end the match.
Tap the "L1" button without holding the "L2" button to perform a regular finishing move. This is a basic signature finishing move that is not overtly dirty or clean.