OK, ever been in a team for SFK and you get wiped, so a few ppl leave then its almost impossible? Try this.
1) get a team and run through SFK like normal
2) have healer (or someone else, like hunter or something) stand at the door and do their thing
3) when everyone else dies except for the person by the door, that person will get aggro
4) That person must run back down the steps and around the corner
5) Arugal will keep aggro on that person and cant leave the room (He can only teleport to the 3 locations)
6) Team returns and takes out what health arugal has left because he cant regenerate.