I had a poke at addressing that issue a few pages back. I supposed that explosives in the basement were used to undermine the fundemental stability of the building first. But like when a house suffers susidence the house remains standing but over time cracks begin to appear as the load bearing becomes shifted gradually to other parts of the building than the foundations. So I'm guessing that perhaps the bombs there were designed to create an instant subsidence effect. In other words the building still remaind standing but was now weakened. And that other events later would cause the second stage of the collapse to take effect.
How by the way do you know what burns to whom were caused by flash fire rather than some effect of explosive? Anyway didn't you say a few posts back you no longer subscribed to the 'fireball' in the lift shaft?
I posted a critique of NIST a few posts back in one to MikeMcc its worth having a look at.
random post of SLRBoy came back with a score of 6.42..classified as high wankyness