Although the active skill of the giant mutated ape was undoubtedly powerful to the point that it could make an enemy despair after a close and hard battle, it was also a skill that consumed a great deal of Mana and probably Stamina as well. At least this was the conclusion to which Bai Zemin himself had come to after studying every sign shown by the beast after the activation of the skill.
The monster's body was no longer firmly standing, its limbs trembled slightly, its breathing was agitated to the point where steam was coming out of its nostrils, etc. These were all signs of exhaustion.
However... Bai Zemin narrowed his eyes and realized that Chen He only had about three or four arrows in his quiver, which meant that he could no longer continue fighting. Furthermore, Shangguan Bing Xue herself had exhausted quite a bit of Mana and although she could still stay in battle, her chest was also rising and falling somewhat erratically with each of her breaths.