It's how he stepped in. The shot @ :24 seconds was a tap. Let's be realistic here.
if u spit on someone that is considered assault so a "tap" is definitly. That drunk bully deserved every bit of what he got, if not just cuz of his bushy head, lol. seriously tho, the 2 initial victims were basically suckered punched so why not give him a dose of his own medicine. and the only reason he went out so easily is because he was so drunk, it really doesnt take much, although that was a great shot, BOOM!!!! LMAO.
And i can tell ya from experience if you go getting in the middle of a drunk and angry mad man it will not end with him walking away, more times than not.