The witness stated that no decapitation occured the animal was just enviscerated live in front of them.
If you have held a live soft shell turtle, at correct body temperature, you very quickly learn that decapitation is extremely difficult too do. In practice, much more likely is just a brutal envisceration. In addition too this, there is evidence of chilled freshly killed turtles sold, "poly wrapped" on the chill counters, again with "Head on".
http://www.careforthewild.org/defaul...3§ion=Home Link for article with Photo's and Video.