In a recent interview with the BBC, Roland Angle claimed that NIST did not have any explanation for the 2.25 seconds of essentially free fall descent observed during the collapse of World Trade Center Building 7, saying:
But NIST actually DO have an explanation for that, in their report on their collapse, and summarized in the FAQ
Their explanation is the buckling of the exterior columns (which happened after the collapse and buckling of the interior columns). Since a buckled column supplies only a tiny fraction of its designed resistance to vertical load, the result is very close to freefall.
AE911 Truth must be aware of this, so it's rather misleading on their part to suggest otherwise. It's fine to disagree with a complex analysis, but not to claim it does not exist.