Some Good Debunking

Going on here (scroll down).

At precisely 15:19 of the video, the North Tower's collapse begins. For reference, free fall time would have been 9.2 seconds from the roof to the ground. So if the building collapsed at free fall speed, it would have been completely collapsed (i.e. the roof would have reached the ground) at 15:28.2 of the video. But look at where the collapse initiation point (the point where the building begins to collapse and then continues downward) is at 15:29 (the ten second mark), by which time the roof above the collapse initiation point should have reached the ground if the building free fell.

Simple questions: Has the building completely collapsed by that point? (answer: no)