all of that is utter bullshitWhen you use the word "they" are you referring to the 400 structural steel connections that would have had to fail across each of the eight floors for free fall to occur?no, they didntDavid Chandler's calculation of 2.25 seconds of free-fall speed correlates to a distance of 100 feet or approximately 8 stories.
The Republic article makes the claim on page 23 that "... more than 400 structural steel connection had to fail per second evenly all across each of the eight floors involved."
"These failures had to occur ahead of the collapsing section--NOT caused by it--because a free-falling object cannot exert force on anything in its path without slowing its own fall."
and as shown by the full video, some started way before you saw the remaining building collapse
why are you going back to already debunked issues again?
Are you disputing David Chandler's observation of free fall for 2.25 seconds?
Do you think the collapse of the mechanical penthouse prior to the straight down descent of WTC7's roof-line occurred without explosives?
with the exception of the 2.25 sec part