I have gotten to the section in Reinholds Retreat where you have to free somebody and get the thiefs apex stone (the serpent is wrapped around that person up on a huge pedestal) but one of the bad guys is stuck in the air and I can't kill him. The first time through he was stuck in a different place that I could hit but his health would reset as soon as it hit zero. I have worked through the dungeon several times and the guy is stuck in the air in different places each time. Anybody else having issues with this quest?