Looking at my new-used fishing book (thanks docstash) and it seems on a cast (fly presentation) one is to adjust the sink tip with a pull & lift as to set-up straight and take water tension off the line, this begins the dive. Talking about lifting most or some of the tip out of the surface film and a draw back upstream... Then of course your decision of mending fly line to set up your swing. How many of you do just this? Hope you can understand its a bit hard to explain without a visual. I found this interesting since most everyone I see fishing just makes the cast and then swims the fly to the best of there experience. Thanks.