As part of the Flesh-Eaters that descended from zombies, Santana possessed a powerful sense of smell. He could easily discover the location of humans based on their scent in a 300m.
Within that area, Santana’s ability to suss out humans was even stronger than the RH2 with all its receptors.
The moment Santana rushed into the boulder formation, any soldier he came across would be slaughtered and their brains sucked dry by him. A Type 3 Divine Warrior’s strength was invincible to an ordinary person. Without an expert with a similar strength to defend, Santana could easily slaughter all 1,000-over soldiers of the resistance.
In this world, the human resistance was at a disadvantage purely because of existences like Santana.