Well obviously, 9/11 was a day when people got used to huge sounds (like towers collapsing for instances, planes exploding) so it did not come out of the blue.
I disagree. This was an existing video of the men reacting to something else. Something that was not sudden or sharp, like an explosion. Someone then added a pre-existing explosion sound effect to the video.
Moreover these are not "enormous" explosions and the video is pretty difficult to interpret anyway., I'm not a sound specialist bu you may be right.
No, it's not difficult to interpret. Can you not heard the distinct separate channels of the explosion?
As for the CNN video, that is still a hint that something is utterly bizarre in the no-CD theory. "blow up" is not a term you use like that. Plus the guy who says "she's about to blow up" seems kind of enthousiastic (not afraid or sad) Watch it again you'll see and hear.
I totally disagree with your interpretation of the tone in the voice of those talking. Two people use the term "blow up". The first is a police officer telling people to get back. In the context of what is happening he seems slightly bored to be honest (no doubt sick of telling firemen and journalists to get back).
The second is a spectator - the cameraman, and he doesn't sound overly excited, though slightly more so than the policeman. Again, this makes sense. He's a cameraman for CNN, he's obviously been in New York for hours. He probably didn't catch any of the early action, so he's been sitting around for HOURS waiting to catch something good. Finally he's told a building is coming down (coincidence that he uses the exact same wording a policeman just used right next to him? I doubt it, he's parroting what he just heard). So yeah, he's excited.
What you're ignoring, and what is most important, is that from the nature and context of these statements, it is quite clear they are expecting the building to collapse due to fire and damage, not from a demolition. They are reporting debris falling, so WTC7 is already falling apart by this stage.
So, do people ever use "blow up" when they mean "fall down"? Sure. People use the wrong words to describe things all the time.
-Gumboot