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You did not answer the question in the slightest.
I didn't ask you the cause of anything.
I laid out in this post: http://www.internationalskeptics.com/forums/showthread.php?postid=4900623 the direct consequences of one row of columns (on floor 98) failing.
The method of getting these columns to fail are immaterial for the purpose of this discussion. It could be by buckling or by explosives.
The important point is that, as a direct result to the 3 story columns, plus the 1 story stagger of adjacent column assemblies, the damage to the floors above & below the 98th floor are considerable.
That is, the columns on the 97th and 99th floors are NOT, as you claim, "undamaged".
You have acceded that, "perhaps it's only the the colums below the 96th floor that are undamaged."
This is too far to go with you. I want to hear your comment my damage assessment for the columns, floors & cross trusses IMMEDIATELY AFTER the columns fail, but BEFORE the upper block impacts onto Floor 97.
Tom
???? If local failures of any kind occur in a structure, associated elements will displace, e.g. the ones above move down by gravity when WTC 1 part C drops. The ones that are fixed to ground, part A below, will not start to move. They may get locally damaged at contact ... but they will not move. And they will not be one-way crushed down.
Clear?
Drop any C on A and check yourself.