This fly, when tied as depicted, will ride flush in the film and can be, your choice, an emerger or adult. I imagine if the fly was pulled under or just went under, it could be presented several inches beneath the surface. The overlay of pheasant tail fibers gives the two tone affect that you perhaps have seen with the ‘Skip Nymph’ (Skip Morris originator). The wire ribbing will add weight to the fly and perhaps, if not ultra thin, pull the fly under. Possibly use mono as a ribbing or make certain it is ultra fine wire. The hackle is wound and cropped across the bottom similar to the fan shape of a comparadun. This style of abdomen/tail would work great with the hairwing style also.