Willing to kill? Have you ever beaten the hell out of someone before? Usually when they're done... they'd go into fetal position and cover up. Or they just get knock the F out and lie there motionless. Are you saying that you're willing to, say, stomp on the head of an unconscious man, on the ground, repeatedly until his skull cracks and brain oozes out so he'd die? Or something like that? Is this what, "willing to kill" means? Why can't you just walk away after the KO?
Otherwise, you're just throwing strikes to the best of your capabilities, up the point where the fight/conflict, ceases....and a KO is almost a guaranteed stoppage in the street, which makes it sound really a lot like a sports fight in the ring.