Bruce Lee skill
In the episode 7, Steefleur suggests Max to use Hokuto no Ken's technique to open a break in a wall in the Purgatory labyrinth. But Max mistakes it with the Bruce Lee Dragon Fist which doesn't have any effect on walls.
While the main shooting key is pressed, the player chains punches very fast. When the key is released, the chain breaks in a overpowered kick. The Herculade doesn't raise the power of the punches but does it for the kick. The power of this kick depends of the choosen character but the punches power is the same for everyone. Probably because these punches are made for speed.