Thought that I would add another bit of Info to Mr Randall's knot.

I was reading an old "Outdoors Book" that had a section on Knots and Knot Tying.

Mr Randall's "Lanyard Knot" is a knot used to join two different sizes of lines together and is called a "Water Knot". Mr Randall, being a Florida Fisherman, would know this knot.

The book says that "the knot is very strong and once tied is very difficult to untie". But Mr Randall apparently saw that he could adapt the knot to allow a very secure method of knife lanyard retention to the wrist and still remove the lanyard when required.

You pull on the "tag" ends and the loop opens up.

"Oldguy" said that the knot was an old fisherman's knot which has a lot of truth. This specific book called the knot a "water Knot"

Tom Vaught