After reading the other thread, it makes sense. Dont forget PK means Player Killing. There are no actual rules or law on how to kill a player but arrowing a crowded area is pretty cheap. For Sparring, its meant to show the other opponent whos stronger and more skillful though things like lagging and wall sparring are something people hate, its just an unintentional (for lag) and coward (for wall sparring) way of sparring but not illegal. There are always going to be things that are legal to do but it becomes to the point where people abuse that thing and then other people will considered it illegal because its cheap. Boosting kills/spar wins secretly, off the same character, and hacking to have high, superior advantage are few illegal things.