Hien fight was easy despie me reading some horror tales here and expecting the worst.
Just apply Aero to the sub guy, ignore the main guy, spam stone on the sub guy and take him down with help of Hien.
Once dead focus with hien on the main guy. On aoe phase just kill middle one and you're good (much like BW dng). I found Hien was always stood in the middle aoe.
Heal when needed. Cleared it first time with no issues. You can't really go wrong with 4 buttons, one of which is a mana boost and I don't even play healers outside of levelling through DD to 70.