Time had passed. The battle between the challenger of the Tower and Commander Cargan and his troops was reaching its peak. It was a spectacle, but the great disadvantage of the Sand People in this sand temple was that they didn't have any active skills to use against the invaders. Even though that was the case, their weapon mastery, which was mysteriously passed down by the Sand God, was more than refined.
Simply, they were war veterans, but the Tower of Growth had nerfed them with its will and "program" that would serve as an adequate challenge on the challengers, including some of the monsters on the lower floors because something like Murlocs could be found on higher ranked dungeons — either Strayed or Dungeon Tower.