All previous versions of this video showing the collapse straight down of WTC7 began after the cave-in of the Penthouse at the top. This unedited video starts before the Penthouse at the top collapses and very clearly one hears the sound of an explosion initiating the collapse sequence.
Also, when a building is damaged it is never damaged equally all around and the building wii ALWAYS fall sideways, never straight down. Only controlled demolition, where all sides are debilitated at the SAME TIME, can bring a building straight down.
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