Reply #107: I found the rest of the quote

[hack89]

Upon a preliminary examination of the middle cases, it became clear that the towers would likely remain standing. The less severe cases were discarded after the aircraft impact results were compared to observed events.

In other words, the middle cases did not produce the results from the videos. They used the videos as ground truth to calibrate the model inputs.

Are you saying that the videos don't give an accurate impression of what happened?