Rulebook page 18: (bold emphasis mine) "If the heroes decide that things are too grim for them to continue on inside a dungeon, they can decide to leave a dungeon and not come back. To do this, they must simply all return to Tamalir at the same time (via glyphs of transport – see “Using Buildings” on page 21) and announce that they’re fleeing the dungeon."
What the heck does "at the same time" mean? Individual hero turns are discrete events, right?