Reply #67: it actually the most simple way to look at it. and it's on video.

[LongDistanceRunner]

you see the buildings fall.
you time the fall.
you compare this to how long an object in freefall would take to reach the ground.
you realize that these numbers are nearly identical.
you wonder how this is possible when there were 80 stories of undamaged core below the plane impact.

you come to the conclusion that the explanation given is literally impossible.
you look for another explanation.