The Blood Bight is a quick and easy knot that forms a loop mid-line. If tied as an end loop it is named figure eight knot. The blood bight is often used by fishermen as it can be used to attach extra hooks or to attach dropper lines to hooks or sinkers. The blood bight only retains 50 percent of the lines original breaking strength so use other knots if you want a strong knot but can be useful for fisherman in that the knot can be used where you want the line to break if you get hung up on something and want to save any terminal tackle that you attach above the knot.