Tang Yin had realized numerous things during this fight that would be crucial to him in the coming days.
That is why he was now looking thoughtful.
Actually, he was not entirely worried about the Heir of Death, for he already understood how strong he was. A being capable of bringing an end to the age of the gods, how could he be weak?
Although he had been surprised by his abilities, he also understood that as long as he had the Law of Control, at least he would not be totally harmless against him.
Besides, he still has yet to understand the Law of Control and its capabilities, so he just has to be patient and continue to understand it.
And that is where he is thoughtful.