Because at this moment, he simply could not exert the strength of the 'Three Certificates'.
In addition, there was the aftermath of using the Buddha's true blood, which could erupt at any moment, leaving him completely devoid of the will to fight.
After all, if he were to use divine skills, he would inevitably trigger the 'Star Fate Divine Skill'.
And without using divine skills, relying solely on the power of his physical body, he was completely unable to contend with Tan Shuchang. A single punch had made it clear to him that the strength of Tan Shuchang's physical body might even surpass his own, which had been enhanced by the activation of the Buddha's true blood.
So, if not now, when would he flee?
As for the young Daoist priest, he had already fled a step ahead when the Ancestor of Guan He Xi Tuo Mountain made his move.
After all, where there are green hills, one needn't worry about firewood.