Kamikaze/Sheepshank Knot

Just out of curiousity... on Man vs. Wild, Ireland, he used a know he called a "kamikaze" but ive found to actually be a "sheepshank", to rap down a cliffside. so just wondering, has anyone used this? Im not planning on trying it (so please, no comments on why i shouldnt try it, haha) but i think itd be a good skill to have on hand if ever in a survival situation. AND, does anyone have step by step pictures of how to make one? (again, im not trying it...)