Full version of 60 Minutes clip

This was part of a documentary called 9/11 played on Channel 9 on the 6th September, and is the source for the 60 Minutes clip. Towards the end you can hear people reacting to the situation they are in. Why is it that the versions on the web are quiet towards the end?

www.youtube.com...

Here is one of the same shown in the US for comparison.

Comparison