Shi Nian nodded at Tang Yanqing, then helped Spicy Girl upstairs.
Tang Yanqing stayed behind.
Once the students had all left, he slowly walked to the school security office.
The police's yellow tape was stretched at the entrance of the school security office, yet Tang Yanqing started scanning the area from the entrance of the apartment building, not leaving any corner of the long corridor unchecked.
Finally, he entered the school security office, and the CSI staff had already withdrawn. He silently signaled to Jia Tianzi and Guan Liang with his eyes.
He looked around, but his gaze was drawn to an elongated bloodstain on the window, so he slowly walked over.
Standing in front of the window, he moved his feet left and right, adjusting his angle to look outside the window. Then he reached out and measured the width and length of the bloodstain.
