in http://www.tip.it/runescape/?page=dungeoneering_guide.htm#puzzles

 

It says

 

Teleports

Teleporting your way through Daemonheim is vital for both dangerous and non-dangerous situations. When your inventory is nearly full or you're low on health, use the free home teleport under your magic spell book tab to be teleported back to the smuggler as often as you wish. The party leader can drop a group gatestone anywhere, which can be reached by diving into the gatestone portal in the smuggler room. You can also create a personal gatestone and drop it in a room of your choosing (Note: A personal gatestone crumbles to dust after one use). A personal gatestone is the ONLY way to exit a boss fight, so it's CRITICAL to set one up before you enter. See Dungeoneering Skills - Magic for more information.

 

But you can also escape using group gatestone, and group gatestone isn't your personal gatestone.

Thanks for the submission, I've made the change and you've been credited. :thumbup: