Explosions generally violently eject things within their blast radius, including beams.
it's clear to me that the force of the plummetting upper section - to this, you need to look at how WTC1/2 were built. They were a complete network of steel, and the only way floors 80 and below were compromised from doing their job of holding up all the floors above it, were as you noted.. with demolitions. Which are explosives, which eject things from its blast radius, including beams, laterally.
Explosions generally violently eject things within their blast radius, including beams.
it's clear to me that the force of the plummetting upper section - to this, you need to look at how WTC1/2 were built. They were a complete network of steel, and the only way floors 80 and below were compromised from doing their job of holding up all the floors above it, were as you noted.. with demolitions. Which are explosives, which eject things from its blast radius, including beams, laterally.