You guys need to realize this kid just went to an online forum for advice/lulz. Stop getting so complicated with advice, stop with the karate kicks, stop with the 1 inch punch to kidney liver death combo.
if thats sarcastically i know my advice probly sucks, never been in a fight before, but my older bro was in like 20 in highschool, im talking nasty fights like slamming people into cars and stuff, and he gave me some advice.
Use your whole body as a weapon, you have two arms and two legs. Be fast and be strong. It doesn't matter all on strength if you have good technique but strength is always a plus .
Try avoiding the fight, if he hits you first or sucker punches you it doesn't matter if you win or lose. It is disrespectful to do that, if you didn't start with him you have nothing to worry about. Your not a pussy for not fighting him unless you have a legit reason. If he does sucker punch you or hit you just stay on your feet and have your hands out ready to block punches and throw them. Take him to the floor if you get the chance.
Run up to him quickly pressing and holding R1 to put him in a choke hold, quickly press x to drop to your knee. Re-tap R1 and a quick left analog stick movement to ground choke him into sweet, sweet unconsciousness.
Then gore his fucking ass with a knife while he's face down in the dirt.
stomp on his foot when he does the chest bumping try to make you flinch thing, this will make him lean forward and loosen his stomach muscles, hit him right under the ribs with a uppercut, put as much strength as you can in that punch, this will knock the wind out of him and make him lose all will to fight, if hes a real determined bastard then hit him a few more times, i have actually done this many times and it has never failed me.