*** This was done years ago by femr. It gives plenty of time to study the plumes, but more importantly the fact that the building itself is not collapsing or even falling. The only thing that is falling is the material that has been blown outward. It was in free fall, but the outer walls were not, so the speed of the outer walls was less than freefall until the explosions destroyed them. That explains why the huge chunk of wall from the top passed the one from a lower elevation. The building was destroyed from the top down.
The only building that collapsed was building seven, which can plainly be seen falling in a classic demolition.
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