In the excellent documentary aired (I think) on CBS a couple of months after 9/11, the firemen were in the first floor of the WTC hearing the bodies thump LOUDLY just outside. They knew what they were, but said nothing about it. One of the firemen said later, "How bad does it have to be up there to make jumping the better alternative?"
That's what always chokes me up - I can't imagine how terrible it was to think the best way out is to jump. I just can't imagine that. ** wiping tears **
God bless their souls.