According to Osho, 'fighting without attachment' ends violence only when it springs from wisdom: seeing that killing or saving are illusory and that the real sin is a violent will. In samatvabuddhi (equanimity) one transcends both violence and non-violence; the violent mind drops. Then action happens through you without hate or ego, so conflict may occur outwardly, yet inner violence has ceased.
If you stop wanting to hurt and see no one is truly harmed, even a fight won’t make your heart violent.