Collapse, My Ass
Where on earth are the rest of the MASSIVE base columns from this west wall of the north tower? (You can see the base columns for the north wall in the background.)
Note the debris pile on this side is simply not that deep, as evidence by the man in the foreground and the fact that the part of the building in front of him is essentially the ground floor!
Here, note the partially vaporized cladding on this section of wall: