Reply #2: This could have been WTC2 coming down.

[Carefulplease]

The initial story you linked to reports an ambiguous sequence of events.

http://www.record-eagle.com/2001/sep/11scene.htm

It has been reported already (NIST Interim Report on WTC 7) that after WTC2 collapsed, dust covered WTC7 lobby areas at floors 1 and 3. "After the first blast" is imprecise. You assume that it must refer to the first aircraft impact. You also assume that "another explosion" must refer to something else than the collapse of a WTC tower. The story is not precise enough to tell. It does not even report the words of either Jennings or Hess. The writer of the column could have misinterpreted their story. The writer's own interpretation isn't clear anyway.