I believe your analysis is incorrect, and the timestamps are explained by two cameras and some sloppy editing, but that the events took place in real time. See http://www.truth-teller.com/000041.html for an analysis of the timestamps. Also, although the video is poor quality, I believe can see bloodstains spreading over the clothes on Berg's shoulders as he is cut. I can see wetness on the knife without any doubt, and redness appears to be pooling on the floor in a spreading puddle. If you watch closely you can see dripping from the head when it is held up. This is very gory to view or discuss, but I believe the video presents everything in real time and can be taken at face value.
bump...
I forced myself to watch the video, because I knew this was something I had to do, draw my cnclusions and be done with this lesson.
I am a country boy too and I have also seen animals being killed. When animals are first electrocuted and then their blood drained, the flow is not as strong.
I also noticed how still and calm he was throughout all this lengthy speech - his body language was inadequate for the kind of situation he was in.
Today I also heard from some TV stations , that he had been learning Arabic and that he met with his deceased sister's husband. This makes me think that he probably knew at least a little Arabic to know what was about to happen.
My conclusions:
1) He was drugged with some drug or medicine, which slows down the heartbeat - this explains why the flow of blood was not strong and his behaviour during the speech, as well as the lack of any violent response to the attackers when they did it;
2) The screams are too long, compared to the time of the killing. After the first cut, there could be no more screams;
3) The above 2 points make me conclude that the killers must have recorded him screaming before that by using some scary tactic to make him scream while he was conscious;
(BTW, do we have samples of his voice from home videos, speeches or other sources? Have those been compared to the screams in the video? Do we know for sure these are his screams and not somebody elses?)
We all know the rest. Obviously their main goals are:
1) to deliver the message to their supporters - "Allah akbar', etc., i.e. recruiting purpose among Muslims;
2) to deliver a message to everybody in the USA camp and to those who think of joining the US camp - this is what expects you, if you do not give up and leave;
It is gruesome, sickening and IMO very miscalculating on their part. This deed did not promote their cause.