With regard to the 'edit' at 19:40, we can hear live CNN coverage in the background.
Here is that CNN footage:
http://www.youtube.com/watch?v=B5bVVc8bhac
The tower begins to collapse as the presenter says "in washington there is a large fire", at 8:23 in.
In 'what we saw', at 19:40 the man says 'Oh my god' as the CNN presenter says the exact same sentence.
Mancman,
You get the award for the most useful post yet.
First observation:
The flashes in the Bob & Bri video at 7:53 are simply falling glass. If you watch carefully it is two flashes from the same piece falling. To confirm this, go to the 7:56 area to see it continue its fall in between the bands. Also watch closely around the 7:44 area and you can see another one there above the top band briefly. I don't know what the "pop" is but it is not related to the glass in my opinion.
Thank you for the CNN soundtrack. It was painstaking but I was able to create a timeline from it. It answered a couple of questions. I won't force you through the details - a summary should suffice.
Second Observation:
In the What We Saw video after the last dissolve ends at 19:22 they shoot continuous footage from 19:23 to 19:41 when the video is cut. It is at the 19:30-32 second mark in this video we should hear the first explosion that the Siegel video associates with the North tower collapse. It is not there.
I have gone back and found the original release of his video and compared it to the new one. The sound quality is better now but there has been no manipulated sound alteration in my opinion. I don't know what would account for the sound in his video at that point. Wind is a possibility since I found this recording where somebody was talking about the collapse of WTC7 meaning that obviously all collapses were over. In the background at about 2:08 into it you hear most likely wind that sounds similar to Siegel's "explosion sounds" prior to the North tower collapse.
http://www.youtube.com/watch?v=uVdnFFNbPK8
I have to admit in Siegel's video the fact that the sound occurs there is anomalous. I believe that in the first and second tower collapses the rumbles of the collapses are accurate though. It is just the sounds preceding the North tower collapse in question. I will look at the South Tower sounds later as time allows.
Now for Bob and Bri. Bob and Bri both say "oh my god" during the 19:40-41 time frame which would correspond to the visual recognition of the collapse. This is matched to a visual link between their video and Siegels. Bri's "oh my god" is obviously cut off at 19:41. Then using the CNN audio it is indicated very clearly that 5 seconds of their recording is missing. It is not dissolved - just cut or not recorded. We won't know until the unedited version is released.
Bob and Bri would be subject to an approximately 1.5 second sound delay. So you have to figure that to the five seconds missing which means for 5 seconds starting 1.5 seconds
before Bri is cut off we have no audio record. We don't hear any sound before Bob says "oh my god" at 19:40 to when Bri's is cut off at 19:41. Bri's cut off would have occurred about the time the sound from whatever made Bob say "oh my god" arrived.
When you go back to Siegel's video and listen to the sound associated with the collapse, forgetting the anomalous spikes preceding that time frame, there is loud sound in the 5 seconds missing from Bob and Bri's account that can be associated with the collapse. But in the radio audio of Siegel's account you can hear a reporter, Joan Fleischer (sp?) saying there were no explosions prior to the collapse between 39:37 and 40:05. This was not highlighted by text as the reports of explosions had been, so I have to agree opinion manipulation was in effect.
So it seems there were no explosions preceding the North Tower collapse by any significant time separation. The sounds appear to have been consolidated within the event. When time allows I will look for explosion quotes regarding the North Tower collapse to asses proximity to the event for those.
Because of the 5 seconds of audio/video missing from Bob and Bri's account we don't know if there were distinct explosions embedded into the collapse event. Even if there were, they would obviously be open to interpretation given the general sound of the collapse.
I have an email in to Rick Siegel alerting him of this and requesting a response.
Here are the raw materials to confirm this:
Eyewitness -
http://video.google.com/videoplay?docid=-3498980438587461603&q=eyewitness&hl=en
What We Saw -
http://video.google.com/videoplay?docid=-5370762387415552903&q=what+we+saw&hl=en
CNN -
http://www.youtube.com/watch?v=B5bVVc8bhac
Russell