Yes that was it… although not quite right. The folds of the fabric were the wrong way for someone to have pushed it to the ground. Walking around it, with his back to the mirror, he saw that it was as if someone had come through the mirror and done the deed. How the deed was done was beyond him as there was nothing behind the mirror that could as act as a back door and this was further proven when he tapped the back of the mirror and saw it was solid.