“A key element of the technique is the tuck cast, which boils down to overpowering the forward cast. This causes the fly to bounce back under the fly line. When it hits the water it leaves a good amount of slack fly line on the surface. The slack line allows the fly to get to the bottom before drag sets in.” Ed Engle talks about short-line nymphing, a technique popularized by Joe Humphreys. In the Boulder, Colorado Daily Camera (registration required).