Ten Thousand Shadows Saint Emperor was waiting for Ling Han to make a mistake, and wasn't Ling Han the same?
The Primal Chaos Extreme Lightning Tower could unleash the might of the fourth tier, but it was only a tier's difference, so it was almost impossible to achieve an absolute kill.
After the attack, the Primal Chaos Extreme Lightning Tower needed to recover for a whole 10 days. This was enough time for Ten Thousand Shadows Saint Emperor to flee, or for reinforcements to arrive.
Thus, Ling Han had to wait for an opportunity, or create an opportunity to deliver an explosive, fatal strike.
Among those who could become Emperor, which one of them was not an outstanding talent among men?
Ling Han and Ten Thousand Shadows Saint Emperor were both waiting for the other to make a mistake, and were also actively creating opportunities. However, both sides were cautious enough, and neither made a mistake nor fell into the other's trap.