The Monster already uses the power of the domain. Sam is also not slow and he also uses the power of domain. Both the domains collided with each other and a powerful impact was created in that place.
You can already see those broken walls and everything getting destroyed because of the impact of those two domains.
But both The Monster and Sam did not have any problem with this. Both of them are trying to destroy each other's domain while attacking each other.
In this situation, you can say that Sam has the advantage over the Boss monster. Sam can feel that his domain can dominate the domain of that monster.
Because of this from the moment he begins to use the power of domain, The Monster is in a bad situation.
Currently, both the monster and Sam are seriously injured. But compared to Sam, The Monster is more injured. It already lost its hand and you could see a deep wound present in his back area.