Regardless of whether the Undead or the monsters are involved, even if there were some problems with their plans, their strength was likely to suffer only minor losses. Neither force would be easily wiped out by the other.
Unlike these two forces, Zhou Tian relied solely on his personal martial strength. If either of these forces had the strength to kill him, then any misstep Zhou Tian made could put him in imminent danger.
Therefore, although Zhou Tian knew the outcome of the battle between the two forces was a matter of life or death for him, he dared not reveal himself without certainty of the result. Because Zhou Tian knew that if he exposed himself at this time, his presence would be detected by both forces, jeopardizing his plans and placing him in immediate danger.
Thus, without guarantee of victory, Zhou Tian had no chips to gamble with and would not recklessly reveal himself.