After the initial chaos, players who had gathered failed to find the intruder's trace and began to disperse, except for important locations in the safe zone, and the conference building also started to search from the top floor down—until some players suspected the office staff running around to be the intruder and began violently capturing them.
Because some of these people barely started their search when they discovered the building had collapsed!
Once cracks or breaches appeared, the entire building began to collapse, accompanied by shrill screams. The building collapsed from the higher floors first, and as the fallen floors and the heavy roof's weight came crashing down, it pierced through the nearest layer below. Each new collapse added weight and continued to damage the layer beneath, repeating the cycle until the building completely collapsed!
Players who escaped were stunned, especially those who had taken action: "What kind of shoddy construction was this!"