Look carefully at the pale area (a small rug apparently) which the socks partially cover. This pale area is identically positioned in the two images in relation to bloodspots on the adjacent carpet. Now consider the position of Sheila's right thigh in relation to that area. In particular, imagine a line drawn along the right edge of the pale area in each image. In the left image, the line would meet Sheila's leg just above the knee. In the right image, the line would meet Sheila's leg several inches further from the knee. It follows that Sheila's right thigh is several inches further to the left in the first image in relation to the carpet. It is impossible for Sheila's right thigh to have moved several inches without the rest of the body having moved as well. This can't be accounted for by the different camera position.