The Ancestor had already seen Gravis fight before, and he knew that Mortis could appear and disappear whenever he wanted. The Ancestor still wasn't sure what ability Mortis was using, but he knew what he could do.
The Ancestor wanted to activate his True Law of the Living World, but he saw that he couldn't unleash it. It was almost like he was throwing a stone to the ground, but the stone fell through the ground like it didn't exist. How was he supposed to build something like that?
The Ancestor, Gravis, and Mortis only had access to their Form Laws, nothing else.
Not even the ability of Gravis' new True Law of Sentient Life was useful. Sure, he could use it, but the difference in levels between him and his opponent was simply too much. Gravis would basically only waste his Energy.
Over the years, the abilities of the Laws and the complexity of his and his opponents' arsenals had grown more and more.
And now, it had returned to simplicity.