It's a funny way to tie Raymond's shrimp. The feather is on the fly's belly and the floss is wound thru it. I never tried it as (back then) I didn't want to find out I needed a third hand. There's so many scud patterns now that it's not funny. There's also an oil filled tube body wrapped scud. Back in 1977 when patterns were simple, tying abilities kinda lame and less material available I had a scud pattern that I fished at Chopaka one trip that was just angora goat dubbed on the tying thread. It wasn't neat either.