where things become different is towards the end of what would be your normal drift. instead of picking up to cast again you will allow your indicator/fly to swing across the current, slowly if at all possible. in order to get a nice slow swing you might have to add a mend or two along the way. in a fast current it can be beneficial to feed out a little line from time to time as the fly swings, in order to keep the fly low in the water column, where the fish are. adding a bit of movement is a great idea as well, and you will want to 