[...] He had called the station from inside the first tower to describe what was happening. The host quickly thanked him for calling in and then said, in a bit of a panic, Why are you on the phone with me? Why aren't you on your way down?

You don't understand, the man said. The whole center of the building is gone. I can't go down. That's why I'm calling.

I don't know how to describe the feeling I had in the silence that followed, except that it was approximately the length it would take you to read this sentence aloud.