His eyes clearly saw it. The unknown white light that came from the muscular humanoid demon's body and invaded Robus' body, making the latter unable to move, seemingly having his whole body restricted by something.
And the result of Robus losing his ability to move his body in a fistfight was clear. The huge force behind the muscular humanoid demon's fist then blasted Robus' huge body backward, sending the huge gorilla flying off the ground for a while before landing on the ground.
Though there was no real damage to Robus' body other than a visible mark on the dark earth armor on the part where the muscular humanoid demon's fist had hit the armor, the sight of Robus's huge body flying backward from a punch of another demon was a sight that Blake rarely- even had never seen before.