And that's what happened with WTC7 during those 2.25 seconds of "free fall". The columns below had buckled, and offered negligible resistance. Still tons of resistance, but compared to the mass they previously supported, it was practically nothing. Hence 99% freefall.
I'm curious what evidence is there of the columns buckling? In every video I've seen of WTC7 the buckling is hidden behind other buildings, the video that Cube Radio posted isn't entirely clear (within the same standard of evidence that applies to no jolt claims). Is your position that buckling as described by NIST is possible, or it is that it actually happen?
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