This post has no basis in reality like your paper!Sorry to see that you and your colleaugues still terrorize this thread.
Actually I was quoting the Nist report about air planes hitting the towers. No evidence for that, of course. And observed that the towers were still standing, etc. Plenty of evidence for that, though.
But the subject now is what happens at time Tcause more than an hour later in WTC1. Then it is suggested that the complete 'initiation zone' (IZ)(the area where the plane crashed and a fire burnt) suddenly disappears enabling the rigid mass above (RMA) to suddenly fall down the height of IZ and release its potential energy on the rigid structure below (RMB), that happens at time Teffect, i.e. RMA bumps into RMB.
When RMA bumps into RMB at time Teffect, you would expect that first there is a jolt or a little jerk or shake up, RMA slows down, before RMB disintegrates due to lack of strain energy, but none is seen.
Actually, apart from IZ that disappeared out of sight at time Tcause, also RMA seems to have disappeared before Teffect. Very strange cause and effect, to say the least.
Why can't Nist establish times Tcause and Teffect and provide us a time table for these events. And an explanation how IZ disappears (how?, where?), RMA falls down, its energy (easy to calculate), RMA disappears (how?, where?), the strain energy of RMB (easy to calculate), etc, etc.
It is very disturbing that Nist just produces nonsense - fairy tales - in its scientific report.
Don't blame the piano player if the music is bad. Nist produced the music and, I agree, it is awful.
So how did they fool everyone to think they saw a plane hit?