Ok I love a challenge so I googled "how to tie a shock leader" and bunch of you tube videos came up. Almost all seemed British with the first one done by a Brit wearing a Che Gueavra T shirt. It kinda looked like it started like a blood knot with a third knot added. It was titled A rev olutioary shock knot so not sure if it was for fish or a military coup. Viva la shock!