Bai Cheng'an carefully analyzed at the signal transmission station. Xun Fengnian was holding a knife and acting agilely. Qian Chen's hands and feet were tied, completely at Xun Fengnian's mercy and unable to move, seemingly injured. If he recklessly went out, he might provoke Xun Fengnian into pushing Qian Chen off.
The best way was to bide his time until Xun Fengnian relaxed his guard on Qian Chen. Then, he could stealthily make his way near the fence, pull Qian Chen back within it, and only then engage Xun Fengnian.
For a man of Xun Fengnian's age, even with a knife, ten more couldn't be Bai Cheng'an's match. His only concern now was that Qian Chen was standing perilously close to the edge — a single misstep would be disastrous!
Bai Cheng'an compared himself to the fence's height; it reached his leg. If he crawled on his stomach, using the cover of night and the fence for concealment, he had a chance to hide behind the fence, awaiting the opportune moment to rescue Qian Chen.