Not too long ago, I watched a documentary on the 'Falling Man'. He was but one of the people who either jumped or fell from a window as the building shook. His descent was captured by a photographer who was snapping pictures of the burning tower, not paying attention to what was being captured on film. When the film was developed, there was the 'Falling Man'. It took quite a while, but his identity was eventually discovered. He had been part of the staff at the restaurant Windows on the World, on the 107th floor. It was a powerful documentary.
As both towers shook, people who opened windows to get breathable air were in peril of falling, and so many did. Others chose their fates, as opposed to being either burned alive and suffocated. What a horrifying time those dear people experienced.