you try using the orb in the white circle during dreadtooth?
what is that circle for?
also i think the title resurgest is a clue
the white circle is a marker for the point where you first pulled dreadtooth, anyone in the ops group within a certain distance of the circle then receives the drouk hunter buff.
"the Resurgent" refers to the stacks of "Dreadful Resurgence" we put on the boss.