Luo Zheng did not immediately respond to Lan Xue's question. Instead, he watched the video with a pensive look. After watching it, he replayed the scene where the person squatted down and realized that the person's shoelaces hadn't come untied. Why squat down to tie them? Luo Zheng's face grew increasingly grim, and beside him, Lan Xue noticed the issue during the replay and looked at Luo Zheng in surprise.
"Don't rush, let's watch it first." Luo Zheng said softly, signaling Lan Xue to stay calm to avoid alerting the snake hidden. He replayed the video again, but this time focusing not on the shoelaces, but on the surroundings. Quickly, Luo Zheng noticed the box was placed on a drainage cover made of welded steel bars, rectangular and hollow in the middle, allowing water to flow down while debris was kept outside.
"You mean?" Lan Xue pointed at the drain mouth in surprise.
