i was a level 10 blood elf rogue questing between ghostland and everwood. When this unknown level (I suspect is 70) Human warrior came and started killing NPC or some other players who attacked him.

He came infront of me and try to provoke me, even killed some npc so I couldnt hand in quest (lucky i completed it before he killed the guy). Later as I went on to kill mobs for quest this fella killed every mob I try to kill, so I didn't bother him and went to the town in ghostland and here's the funny part....

He chased me all the way in, and even aggro'd a few Guards. He didnt bother them and continue killing every NPC I try to talk to... as I went to talk to the bat handler and he attacked it.... guess what... it spawned 2 level 65 elite fel bat and started chasing (he still couldnt attack me becos it was horde territory and I didnt attack him.)

Anyways the 2 bats and a couple of guards chased him and he started to run... He died before he could run out of town. I laughed like hell later