Uhh... I have no idea what you're saying, but I will do my best to answer your questions
Killaura attacks anyone within a radius of you, making it possible for him to hit you while not even facing you. As for the two guys, it's entirely possible his killaura just plain didn't work. There are plenty of killaura/hack clients for pvp, so I wouldn't be surprised if he just found a not-so-good one that doesn't hit all the time. Some killaura client mods also have a whitelist of people not to kill, so maybe they were his friends? Point is, killaura's a derpy little thing. With the new anti-killaura plugin, I wouldn't be concerned about more usages of this type of hack.
I have absolutely no idea what the point of this thread is. If someone here is fluent in Herpderp, please translate.