That's interesting, first time I've heard of an alternative path back to Warrior's Vault. If the elevator doesn't work I can only think of running through Hero's Pass again. From my point of view it is no big deal because with my gear and skill point allocation I have about 51k shield and 94k health with up to 4% health per second regen. All that allows me to run through Hero's Pass without fighting anything.
If your gear isn't at that level it outta still be possible to just make a beeline for the transition point. I tend to just run with a rocket launcher to get quick Secondwinds in case I fall while running.
"You must gather your party before venturing forth" "Go for the eyes Boo! Go for the eyes!"