second rope and send that through the figure 8 of the first rope so that it’s as if the ropes are each others’ reflections in a figure 8-shaped mirror. make a loop at each of the far ends of your central knot mass for added security. if you are in fact falling off a cliff at the moment, do all of this quickly.
this is an extraordinarily useful knot because it requires that you have only one rope to make it. this is a situation climbers will often find themselves in. perhaps your second rope was thrown off of the side of a cliff, either as a way of making an 