Ive ended fights by...
*Diffusing fights(the BEST way to walk away untouched,obviously and the first thing you should try to do.Speech and de-escalating can work in some situations like where there is 3 or more people and the odds are stacked.Should always be the first effort you make)
*Top mount and right punch
*Standard front headlock/choke and strikes to the kidneys(after an attempted takedown)
*Right hook,left hook(two seperate occasions)
and thats it...nothing special.In sparring,stong front kicks always beat a roundhouse in my experience.The time it takes for a strong roundhouse to arrive is longer than a straight front kick/push kick to the gut.
Try once,fail twice...