Blind rage is a feature in Scarface - The World is Yours. When Tony goes into a total rage for a short period of time, it gives him the power to be invincible and have unlimited ammo, also puting a target on his enemies. This can be done with any weapon, though it seems to last longer with melee weapons. It also gives 200 health for every kill performed (filling the meter with 4 kills). Blind rage can be used once Tony's balls meter has become full.