Instructions
Load the game and select a fighter. Check the fighter's action list to confirm that the flying knee technique is available for him. If your fighter cannot perform the flying knee, choose a fighter that has the technique in his action list, such as Mauricio "Shogun" Rua. Alternatively, create a fighter by choosing the Muay Thai style and work your way up until you can train him in the technique.
Throwing the flying knee within a certain range can score a KO. Outside that range, it will cause damage to your opponents' arms and body. To practice the flying knee to the head, go into Practice Mode and practice triggering the move from different distances. This will improve your skill and give you a good idea of how close you need to be to your opponent to strike his head.
Start a match. Trigger the flying knee move by flicking the left-hand analog stick. This technique can be challenging, so be patient and practice the movement as lightly as possible, brushing the analog stick towards your opponent. Press the left bumper button and "B" buttons simultaneously. This command will cause your fighter to move forward, jump and throw the flying knee strike.