The video that started me thinking about controlled demolition

[jgraz]

This is my first post on this forum, so go easy. I'm a strong skeptic of the official story, but I'll be the first to admit that I have no freaking clue what actually happened that day.

For a long time, I thought the proponents of controlled demolition were simply crazy. Then I saw this video:

http://911research.wtc7.net/wtc/evidence/videos/docs/wtc2_demolition_waves.mpg

The thing just looked viscerally wrong to me. Here's a few questions that immediately came to mind when I saw it:

• For an uncontrolled collapse, the process looks extremely regular. Other clips show the top of the South Tower twisting downward as the collapse begins, yet the building seems to come down in an orderly, floor-by-floor fashion. Throughout the clip, the descending line of destruction looks perfectly parallel to the ground. Shouldn't there be some irregularities based on how the collapse began?


• How is that concrete being pulverized? It looks like the clip starts shortly after the collapse begins, but the concrete is already being hit with enough force to turn it to dust.


• Isn't the debris moving away from the building too quickly? The descent of the top does not look like it carries enough force to impart that kind of lateral velocity to the concrete and other materials.


• The collapse looks like it happens at a speed equal to or slightly greater than free-fall, given the fact that it seems to match pace with the falling debris. How is this possible?


• Why are the corners of the building staying intact longer than the sides? The video clearly shows the sides of the building being destroyed while the corners stay solid for a moment longer. If the collapse truly started from the top of the structure, shouldn't the corners crush down with the rest of the floor? The fact that the corners remain solid makes it look like the sides are being blown out by some force other than a vertical collapse.

Since seeing this clip, I've done research and read the various engineering analyses of the collapse. I'm not a structural engineer, so I'm unable to deeply evaluate the opposing theories on how the buildings came down. However, nothing I've read has been able to change the fact that this video just looks wrong to me. From my perspective, the gut feel that I'm not watching a natural structural failure is the most troubling piece of evidence in this puzzle.