 CONT: At Osgiliath. Frodo is seen walking toward the wall and  clearly has no sword. When he stands on the wall and is about to be  snatched by the Ring Wraith, Sam grabs him and they tumble down the  stairs. Frodo pulls a sword and puts it to Sams throat despite the  fact that he had no sword and had been in Faramirs custody and  would not have been left armed anyway.