I'll give John the benefit of the doubt. Its hard to tell what someone means on-line without an emoticon in the post. The reply could be interpreted as tongue in cheek.
Looking at the fly, I don't know what natural it is imitating, but an opportunistic fish could take it as some sort of flying insect. Trout take polypro yarn strike indicators so it would not suppose me if a trout took this fly.
I'm not as certain as Allan on one point. I'm not sure that the fly will helicopter. The wings are not solid, but are of wood duck or mallard flank feather barbules so so they are not a solid airfoil. I say cast it and see if the fly spins.
Regards,
Silver
"Discovery consists of seeing what everybody has seen and thinking what nobody has thought"..........Szent-Gyorgy