Counterflow Analysis

An interesting clip from MANY HI-RESOLUTION VIDEOS OF THE 9/11 :
http://thunderbay.indymedia.org/uploads/north-demolition-pops.avi

Along with the nice dust squibs, something very interesting happens in this video beginning almost exactly at the 5 second mark - at the same time that the camera pans down slightly. This is the most striking example I have seen of the "counter-flow" phenomenon, where dust flom the debris cloud is sucked back into the center of the collapse as if being pulled into the sub-basements.

If you watch it in slo-mo you can see that the thick dust trails streaming back from the larger pieces as they fall are not drifting down in the wake of the pieces, but are actually flowing up and back toward the centerline of the tower. It almost looks like the video is playing backwards... I realize that some of this is only apparent movement caused by the camera panning down, but at least at the beginning there really is a backwards flow of the thick dust, as if it's being vacuumed away from the pieces. More about those thick (as in coarse powdered metal) dust trails: http://st12.startlogic.com/~xenonpup/dust%20trails/

The counterflow seems to start at the same time that the "atomic glow" lights up the left side of the frame, making me think that the two are related. Probably not a thermobaric device in the traditional sense of dispersing a cloud of fuel and then igniting it but similar in principle, maybe the fabled a-neutronic bomb:

"Riconosciuto's talents were much in demand. He had created the a-neutronic bomb (or "Electro-Hydrodynamic Gaseous Fuel Device"), which sank the ground level of the Nevada test site by 30 feet when a prototype was tested. Samuel Cohen, the inventor of the neutron bomb, said of Riconosciuto: "I've spoken to Michael Riconosciuto (the inventor of the a-neutronic bomb) and he's an extraordinarily bright guy. I also have a hunch, which I can't prove, that they both (Riconosciuto and Lavos, his partner) indirectly work for the CIA."

Riconosciuto's bomb made suitcase nukes obsolete, because it achieved near-atomic explosive yields, but could be more easily minaturized. You could have a suitcase a-neutronic bomb, or a briefcase a-neutronic bomb, or simply a lady's purse a-neutronic bomb. Or just pull out your wallet for identification and... The Meridian Arms Corporation, as well as the Universities of California and Chicago owned a piece of the technology."
http://educate-yourself.org/cn/2001/riconosciutoandtimosman8nov01.shtml

Whatever caused it, it looks like the dust cloud blanketing lower Manhattan would have been much bigger and more destructive absent this counterflow effect.

Pup