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At exactly 4:45, someone had pulled the 8th floor fire alarm.
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By 4:40 PM, the cutters finished their work with 5 minutes to spare.
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By 4:45 PM, the workers would be leaving, workers from other firms had left already.
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By the time 4:45 had come, people have tried to kill the fire with a non-running water hose.
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By the time 4:45 had passed, people tried to use the elevator to get down.
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At the same time the elevator was going down after 4:45, the people waiting couldn't take it anymore and tried to run for the stairs.