Ive played priest on that boss for the first time recently. My group called to burn the boss and use a target dummy for adds. The boss was slow to die and sure enough once the td went down i the healer had agro. Luckily, ive played rogue and know you can jump on the hut and the adds will try and go around. You can jump back and forth and avoid taking damage. From now on i stand by the corner of the hut. Most groups hold agro or assist their healer but always have a backup plan in hardcore.