Almost at the moment the sound rang out, Casol's body uncontrollably trembled, and his heart momentarily stopped.
It wasn't fear, but shock!
After the shock came contemplation, and true fear and apprehension followed!
The reason was simple: the person who made the sound had gone undetected by him until the sound was made, much like how he had approached Pandora earlier.
He had overwhelming strength over Pandora, allowing him to approach her unnoticed.
Now, someone had approached him in the same manner. Did that not mean that this person also possessed overwhelming strength over him?
Even if that wasn't the case, it showed that the other party had extremely sophisticated techniques for concealing their presence. Furthermore, their willingness to reveal themselves meant they were not afraid of him, which made him wary.
