Not sure if you heard an interview on Neil Mitchell this week. One guy was there, said he was not built as a person to comprehend it all when it happened. Like in shock and couldnt comprehend the disater unfolding (cant remember the word he used), in fact he cant remember the noise at all. To him not much noise on the impact I think he said but the fireball was what stuck with him coming out the side of the building. Listening to him it felt like his body shut out the noise from shock.something that doesn't get mentioned much is the NOISE it made...
from the planes hitting to the buildings collapsing... it was deafening...