Lower Universes
Yale truly hated the behavior of that young master, who even dared to insult him, so he was decided to act.
Although the one in problems was his disciple, he would have acted in the same way if the target of the young master was someone else.
The reputation of Ancient Master Liye was maintained by the efforts of his disciples and his old master, so it was unforgivable that someone wanted to destroy their efforts.
In fact, Yale would have preferred that the target of the young master was someone else as it would have been less problematic to interfere.
Yale didn't use any of his powers as an Essence God, but those as a Timeless Sovereign.
Laws and Essences didn't exist in that universe, and the training method was completely different, so Yale wasn't sure about how much effect would they have when using them. Moreover, as an incarnation, although his power was still that of an Essence God, he was far weaker than his real body.