In raw power, Sam wouldn't be able to match that Abyss human. But, he has the advantage over that Abyss human.
While fighting that Abyss human he realized that his Origin spiritual energy is the weakness of that Abyss human.
He realized that when he coated his sword with spiritual energy and attacked that Abyss human.
Despite the fusion state, that Abyss human receive massive damage. Other than that, the light elemental attack is also a weakness of Abyss human.
Sam, while being invisible to that Abyss human, attacks that Abyss human from all over the direction. He also made sure he did not get inside the range of the domain.
Despite having confidence in his spiritual energy, he did not want to take any risks.
As expected after receiving those continuous attacks, the Abyss human could not maintain his calm.
Furiously, that Abyss human wanted to find the enemy and kill him. Even the demon core is helping that Abyss human. Unfortunately, despite that it wasn't successful.
