JAY’S NERVOUS SUSPICION had merit. The collapse of the South Tower had sent a pulse of air pressure that appeared to fuel and intensify the fire high in the North Tower. Within four seconds of the South Tower collapse, flames erupted from south-facing windows on the North Tower’s 98th floor, and flared and brightened on three floors just below. Within two minutes of the South Tower collapse, fire spewed from the North Tower’s 104th floor, three floors higher than where it had previously been seen. The fires threatened the building’s integrity, weakening the steel of the North Tower’s core,
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