What we see is ABSOLUTELY a building coming down SYMMETRICALLY.No it wasn't a different event.For starters I never said "all the supports over 8 floors were severed at the same time." Obviously each floor could be 'removed' progressively, so long as they offered no resistance. Still, all I said was that it experienced a free fall through 8 stories.
As to you're point, and I didn't see the model so I am not conceding a .8 second non free fall period.
But if it's as you say, you're making the assumption that what caused the .8 second of non free fall movement is the same "event" that caused the 8 story free fall.
Put another way:
The roof starting it's descent isn't necessarily caused by the same thing as that which caused the 8 story free fall -- it could be the result of something that occurred first in a series of rapidly occurring 'events.'
But you already know that....
The point on the roofline that was used to measure free-fall movement, from beginning (the non-free-fall past AND the free-fall part) to end, moved downward along with the REST of the roofline. Whatever event initiated the downward movement of the roofline affected the WHOLE roofline.
Do you not even understand what truthers are claiming? They say that the entirety of what remained of WT7 came down SYMMETRICALLY. That all vertical supports for eight floors were severed. That is why there was 2.25 seconds of free-fall. There cannot be different parts of the building falling at different times or speeds. That goes against everyting they are claiming.
Or are you disagreeing with what the other truthers believe?
NIST knew for this to occur it would require all the columns on any given floor to give way at precisely the same time and this would need to occur for every floor -an impossibility for an office fire...
Given the events of 9/11 - a high speed impact with a large passenger jet and the ensuing chaotic fires - severing all the columns on any given floor to give way at precisely the same time would have been an impossibility.