This is refering to the part of the Kerran newbie quest where you have to kill the 3 sets of gnolls guarding the "machines" in Peat Bog. When I went to kill the first set of 3 gnolls, I killed the machinist and his assistant as a level 10 Dirge, but when I went to kill the Gnoll Guard he would dissappear occasionally then reappear a second or so later as if he was using snoop or some other combat art. At one point he knocked me unconcious, stopped hitting me, and went invis. When my health had returned enough to get up I moved, he reappeared, and knocked me out again, but didn't go invis this time. He did go back to the spot where he had spawned though. When I eventually was able to get up again I was far enough away from him that he didn't agro, but I was still engaged in combat. After a grueling wait (in combat health regen) I proceded to kill him and got the update.