By the way, do you see how the sagging floor is pulling columns in towards it?
When the floors of the WTC sagged from a plane crashing on to them, it pulled the columns into the floor just the same. But there was a sort of pause. Witnesses even said that it looked like a controlled demolition.
Every 2 floors, the columns were joined, thus 2 floors had to give out at first, and so there was a pause before the top of the structure turned into a big punch, that just knocked out everything below.
The concrete utility core was like a concrete tower inside the visible steel tower.
When the wreckage blew into it, it weakened, and the sagging floor pulled it loose. Many stories of the concrete core punched down immediately after the floors started to go.
Lots of people (even some very famous engineers) tried to say that the World Trade Center was a controlled demolition job and that the airplanes were just a Dodge or a distraction. They tell you to watch the videos because it looks just like a controlled demolition job.
But if you watch the videos of the Surfside Tower collapse, and then the controlled demolition of the remaining Surfside portion, you will notice that they look essentially the same. In both cases, the middle columns of the building were knocked out and it came down suddenly.
Except for one thing. Through the glass windows of Surfside, you can clearly see exploding demolition charges, as the interior columns of the building are knocked out, allowing it to fall into its own basement.
The WTC was glass windows all around, but nobody saw explosions on each level of the interior core thru the glass. So except for that it probably did look like a controlled demolition.