Clear all drakes on the lower platform in a (clockwise or counterclockwise), leaving the droags for a second clearing, as these have a shorter respawn time. KILL FAST, aiming for clearing in 10-15 minutes! If you're not averaging 13k DPS or better don't bother do this. Move raid to top of stairs and body pull the drakes, again in a clockwise or counterclockwise manner. All can be pulled without aggro'ing Harla Dar. Once all drakes and droags are clear, pull Harla Dar to the blocked wall behind the area where she stands (the zone out) and be careful of knockback.