In this quest you have to drink some sort of brew, then run through a series of spirit portals in 1 min 30 secs. Problem is, the quest is seriously bugged in that several of the portals appear in the water, and it simply isn't humanly possible to swim fast enough, unless you possibly have all Points spent at stamina at this point (lvl 40 quest).
Honestly fail to see how such a bug can have appeared without notice in the first Place, but oh well...