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.
1)When it's dark/ getting dark, be extra careful when threading the anchor at the top. Triple check you are tied in properly and if in doubt lower off using the quickdraws.
2) when belaying someone when it's getting dark, prompt them to triple check they have done things correctly before they untie their original (i.e. Climbing) knot.
Sport rock climbing
Darkness, Abseil or rappel failure or error
Rescue Services Involved?