By my lights, the Perry Poke is not a separate spey cast; it's a corrective movement that one may make within a spey cast, if needed. The standard spey casts are named and differentiated by how one moves the fly from the dangle to the (initial) anchor placement. The D-loop backcast and forward stroke are essentially the same in all spey casts. In the middle, there is sometimes a need to adjust. For me, the single spey cast continues to be above my pay grade. I can rarely execute one. The single spey is a splash-and-go cast with an abrupt angle change that I just can't handle. The Perry Poke converts the single spey into a water-anchor spey cast that is easy to do. It lines up the anchored fly and slack line while I rebalance myself for an easy, powerful D-loop. Do you ever wonder why a baseball pitcher coils up like a startled lobster while kicking one leg high, like a Rockette? Because it works for him.