FYI, Nightstalker, Hakke Full Auto Shotgun, Zhalo Supercell. Hit them with my shadowshot, threw grenade, emptied Zhalo into them, finished with the Shotgun. Rinse & repeat a few times or more. Super was usually up as the next wave spawn. Then the big guy spawned. Safety spot was by the Dore you came in. Changed to unloading 1 magazine from Zhalo into the boss, then change focus to the others approaching. Then another magazine into the boss. Think it took 3 magazines on the boss and he was done. Probably more though. No time to think just react and stay alive. :)