In all honestly, I would probably have ran up and attack Duriel. For one, you'd be more well know, ESPECIALLY if you actually took him down and ended his "massacure". Eh, thats my two cents, even though I would most likely not be able to kill a level 111, the fact that someone was fighting back would just show Jagex that good can come in a bad situation. And + if they banned me I'd make a big scene about how I was helping :)