To avoid affecting the actors' performance and to ensure capturing every good shot, Director Zhang didn't let the camera crew enter the hallway. Instead, he set up over thirty of the latest dynamic capture cameras to film this exciting chase scene from various angles.
At that moment, everyone was in the newly built control room on the first floor, watching the tense footage. Bai Xian's stand-in was a retired sprinter and also a high-level member of the Xinhu Parkour Club. He might have misunderstood Director Zhang's instructions because he didn't follow the script exactly. Not only did he not slow down, but he actually surpassed his expected level of performance.
When Bai Xian's stand-in was dashing downstairs at full speed, Director Zhang had a bad feeling. He was about to call cut when something astonishing happened.