There is no evidence that the so called "expulsions" traveled at 80 mph. All the columns which fell away followed the basic law of trajectories. The furthest measured steel from 1wtc was at the Winter Garden across West Street. It's max horizontal velocity... toppling from the 80th floor or so was about 35 mph. What appears to be material flying upwards is mostly material left behind as the "bottom fell out" and the building collapsed down. In order to explain what happened you need accurate observations and knowledge of mechanics. Otherwise you are dealing with garbage in garbage out.