Don't tie a prussick that way. Do exactly what they say, but pull a loop so that the knot is not out on the load bearing part, but instead tucked by the main li

Don't tie a prussick that way. Do exactly what they say, but pull a loop so that the knot is not out on the load bearing part, but instead tucked by the main line. Otherwise it'll snag and cut itself or catch your carabiner and cause all kinds of shock loads. (source is search and rescue training) Ashley's is a great ref, but there's tricks to the trades so check a variety of sources.