From The Grey House:
Vampire hunters consisted mostly of the relatives of the tortured and murdered children who were looking for justice or revenge or both. The Slayers, against better judgment, Natalia thought, decided to take along these humans on vampire hunts. These humans didn’t have the abilities the Slayers did and died a lot quicker. The Slayers in the area didn’t seem to care too much about them and used them almost as cannon fodder. The whole situation disgusted Natalia, who believed humans should be kept out of the shadows and protected.