. . . in 6.6 seconds.
You sure do lie quite a bit, you know that?
The entire building did not collapse in 6.6 seconds. It was much more than that. The collapse started with the mechanical penthouse falling into the building as shown here.
[ame=http://www.youtube.com/watch?v=UkOGkdNq13k]YouTube - WTC7 NIST Clip with east penthouse[/ame]
You choose to ignore this fact. That video length is more than DOUBLE the 6.6 seconds you continue to spout. Can you explain why you ignore the penthouse collapse as the start of the WTC7 building collapse?