I don't think you know anything about 9/11.

For a start, you can see for yourself the "pancakes

This is literally what happened.

Where were the two stacks of 110 pancakes at Ground Zero? First responders expressed surprise at the lack of concrete - as well as furniture, fixtures, glass, bodies - at the site. These were rendered into dust finer than beach sand and fell ankle-deep across lower Manhattan.

Yeah, that's what happens when you have a building that tall collapsing on itself as you describe.