Hi', JW. When boobies were first introduced, the standard method was to fish with a sinker hard on the bottom, and to fish a pull-and-pause retrieve. Fishing static can result in fish taking the booby right back in the mouth, risking or causing damage. Too many anglers already allowing fish to hook themselves on static flies, you are right to query.
The second phase was fishing the booby on a longer leader, with a dropper fly added. This was supposed to copy the pursuit of the dropper by the booby when pulled. Some anglers also fished with line hard on the bottom and a long leader with the booby on the point, at the surface, and a couple of droppers covering more of the water column. To fish that way, you needed to know your water pretty well.
Then I guess boobies were used to suspend flies when fished off floaters, a bit like float fishing; before they were attached to the end of a leader, with droppers between the booby and the fly line. That became known as fishing 'The washing line'. That can be done using an intermediate, also, but I would prefer the floater, especially when fish are taking buzzers just under the surface.
Hope that helps a bit. Cheers, TerryC
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