The harder you get hit, the more your rage builds up! When you enter the red zone (< 20 points), you can unleash a powerful rage attack - which can turn the tables on a stronger opponent. If you're stronger... make sure you strategize and swap at the right time so you can end the fight quickly! If both players are in the red zone, rage is not an option. The chances of landing a rage attack are the same as a normal Ninja Attack.