I can disprove your theory MJN.

I checked on youtube, to confirm how Norg dies myself here is a youtube video, Norg dies around the 2.5 - 3minute mark on this. His death is very normal.

I believe you got confused between the death of Norg and the fake president Deling in the Timber mission as seen here. The transformation in to the hunk of undead love takes place around 22:30 in this video. Though why he transforms we never actually find out. I can guess that it is probably some kind of fail safe mechanism incase of kidnap or assasination.