The only issue I see with that is the use of "we" in the sentence. Supposing an abduction did take place, and that the perp took her from A to X. Then a death happened. And now the perp takes her to B. Why would the man say "Now we need to dispose of the body"? Surely it's he needs dispose of the body! If the man had already taken her from the immediate risk of the crime scene, whatever happened next, he could have disposed of the corpse himself and so it is, and was, his responsibility. On the other hand, if someone turned up for immediate help because they had just killed someone, I can understand why the other person might use the term "we" need to get rid of the body in the sense it was unanticipated and they feel obligated to help. JMO.