They don't explain why, all they say,
"i understand why people might think that, and i see what they are saying, but when you learned the fact about the way building 7 was built, and about the way it supported itself, and the damage that was done by the collapsing towers, the idea that it was a controlled demolition just holds no water."
This is one of the most pathetic answer i ever heard in my entire life.
Then the narration goes,with the video, showing wtc 1 collapsing """ as the twin towers collapse, debris smashed into wtc7""
However you clearly see no debris at all going to the wtc 7 from the collapse.
The final report on wtc7 , is still being prepared as they say, 5 years of investigation to prove that wtc 7 collapsed ,not demolished.
And no word at all , on Sylverstein, not even a single one.