u so beat me to it....
dude if he wants to kill u fight dirty seriously, its a street fight there are no rules and if he wants to kill u, u hav every right to defend urself in anyway possible
watch that self defense video bas rutten knows wut hes talkin about... oh and learn to throw ur hips into a punch (aim for the jaw) it makes so much more powerful and thats how u knock someone out thats how all pro fighters put power in their punch like rampage, liddell, penn i could go on
oh and if it goes to the ground stay on top its important to stay on top and throw elbows theyre pure bone if they go to his face they'll cut him and he'll bleed like a mofo and dont let him get behind u ever