The moment The Monster deactivated the power of domain Sam deserted to activate the power of domain. Instantly a spiritual fluctuation appeared in that place and the 10 km area was surrounded by a spiritual domain. This time the spiritual fluctuation is completely different from before.
First of all this time, he is using liquid spiritual energy so definitely The Spiritual aura will be different. Sam, who can feel the connection between himself and the inner world, is surprised the moment he uses The liquified Spiritual energy to create the domain. It is like the surrounding area turns into his inner world and he has full control over that area.
The monster who does deactivate the power of the domain instantly got alert because he already noticed the moment Sam activated the power of the domain and his instincts were warning him about the danger that was present all over that place.