Most Shorn Cliff routes are single pitch 15 - 30m routes and descent is by abseil. I abseiled off the end of a rope and hit the deck. Minor bruising, friction burns and cuts. Incident was due to human error. I put a single 50m rope without a middle marker through the abseil maillon at the top and threw one end down to check it reached the ground. When it did I threw the other end down, did all my abseil checks and set off. I pinged off the end of the ab rope with some force a couple of metres off the ground.