I Reached the anchor on soggy biscuits as it was getting dark. I Clipped in direct to the anchors with a sling. I then threaded a bight of rope through the anchors. I clipped the bight of rope to a screwgate attached to my belay loop but I did not tie a knot in the rope - it wasn't really attached. Before untying my original (used for climbing) figure of 8 knot I noticed and did it properly.