Halls of Infusion runback skip (It does exist!)
Halls of Infusion does have a runback!
But with a catch: you need to clear right instead of left when starting the dungeon. After you kill the SECOND boss (Gupling Goliath) the first skip will open, and once you kill the third boss (Khajin the Undying) the second skip will open.
You will also get a speed boost to help you get back to your party! How nice :)
Music:
Aaskah Gandhi - Dancing Star