Berg beheading: No way, say medical experts

... according to what both a leading surgical authority and a noted forensic death expert separately told Asia Times Online, the video depicting the decapitation appears to have been staged.

... both [experts] perceived it as highly probable that Berg had died some time prior to his decapitation. A factor in this was an apparent lack of the "massive" arterial bleeding such an act initiates.

Providing another basis for their findings, in the course of such an assault, an individual's autonomic nervous system would react, typically doing so strongly, with the body shaking and jerking accordingly.