What's weird about this video is that it fails to show that video of the back side of the building. Apparently part of one of the towers fell on it, because the slash into the core started at the roof, and went all the way down to the 1st or 2nd floor. It was major, major damage, and there was a raging fire in the core.

Not that it would have fallen in such an even manner from that damage. Would have been awkward if the damage had disabled their explosives setup.