All three of the leader locations are relatively self contained. Follow Glut to her room and close the door. Take out Minthara quickly and take out the floating eye first. Go through the door on the right for Dror and close both doors. Also I climb up the ladder and take out Dror and the others from up top.
I make sure I unlock the waypoint in the Underdark first and save the Dror fight for last after doing everything I want to do in the camp. Then just fast travel out of there. I do go back and clean it out later.
