One thing often overlooked is your attitude. You may remain calm and collected during the 'talking a way out of it' phase, but you must recognise the moment when the shit hits the fan, and change your attitude accordingly. Clausewitz had it right with 'ultimate war' - there is nothing to be gained from holding back. Lose your humanity, devote yourself completely to maiming or incapacitating your opponent. Do not stop until the work is done. Always assume your opponent has had the same idea.