Originally Posted by chrismohr
Cross referencing with floor plans suggests that the dust/debris ejecta are aligned with corridors within the core, which may provide focussing of pressure due to internal descent. One sideline issue is that at least one of the "dust jets" begins before release of the NW corner, providing another cue to ROOSD beginning before
the "upper section" began to descend (WTC1). There is still greyness as to a path being available from the initiation zone to dust jets much further down.
An old image for WTC2 corridor alignment...