 FAIR: To kill Hector, Achilles uses a spear. When Achilles is  dragging Hector back to camp, we can still see the spear sticking  out of him. In the next shot, when Achilles is within the camp, the  spear in Hector is gone. Hector is dragged for many miles, it is  very likely that the spear either snapped off or fell off by the  time he reached the camp.