Oh and another part to add to this idea. Spectators cannot walk through walls or barriers. If the actual team hasn't released a barrier, spectators have to wait till they do to cross it. If all the party members have died and all went to the entrance then all spectators should be prompt to see if they also want to go to the entrance or stay where they are. (since mobs eventually do respawn so it may eventually be a good fight). And finally once the dungeon is finished the spectators have about 10 seconds to leave on there own, run around or chat before they are forced out of the dungeon. (This also prevents spectators from looking at areas before the group went there and give them a heads up.)