When the Rage gauge is full, your damage is increased.
Rage gauge is increased when you take damage.
Rage gauge goes back to 0% after certain time period has passed.
Weapon clash is initiated when weapon hitboxes collide. Weapons must collide at the same time. Characters enter a state where they push each other, and the one who presses more buttons will cause opponent's weapon to drop. There is also randomness factor. When neither character wins the weapon clash, both characters drop their weapons.
Weapon clash can also occur when both characters run at each other. In this case, if character was unarmed, he performs the weapon grab technique on opponent. If both characters were unarmed, both are pushed back and they take minimum damage.
Weapon clash can't occur when timer is 9 seconds or under.
Weapons take damage when they exchange hits, and they can be broken.