The building wasn't expected to fall. The idea was to hit them from the side and knock them over. That failed. The building fell when the center support beams got weak from the intense heat. They could now longer support the tremendous weight and collasped downward with the force from the top pushing the building down. The building didn't collaspe from the bottom, which is what would of happened ahd they placed charges there. Yes, this did surprise the engineers, but that doesn't surprise me having to work with them.
"On Earth as it is in Heaven, the Cosmic Roots of the Bible" available on the Amazon.
