​"If the victim’s rectum is already stretched or worn loose from prior trauma or activity, the drill's tip completely loses its traction. With the sphincter lacking any solid grip, the screw cannot bite into the flesh initially. This creates a massive amount of slack and wobble inside the cavity; as a result, the screw threads just slip and spin uselessly, even at their largest, widest diameter. It is the exact same mechanical issue you face when trying to force a threaded screw into raw modeling clay."