Part 6/10:
A critical argument centers on the fires ignited by the aircraft's fuel, which melted or weakened steel beams. The mixture of kerosene, plastic, and combustibles created a scenario of intense heat that compromised the integrity of load-bearing components. The global consensus that fire alone caused the collapse is questioned, with the narrator implying that the fire's size and heat were underestimated or misunderstood.
Furthermore, they describe the collapse as a domino effect: once the outer shell was buckled, the floors above failed sequentially, leading to a rapid, straight-down collapse. They note the destruction was so complete that the dust mainly consisted of concrete and drywall, emphasizing the destructive power of the event.