What to look at
The first shot shows that even in strong current, the C Cast is very efficient at tearing out the line of the water. But this video shows a situation where I can’t get my line at the right place on my left as the shore is turning. In this case, I must cast at 90° to the other shore. In this case, it is ok as I’m fishing the rocks on the other side of the current but in many cases, it would be better to set up the line a little more downstream to be able to cast 45° on a slower path for the fly.
The second shot gives you the opportunity to see the line placement. Le line is lift out of the water and, when it is suspended in the air, it is time to set it up and THEN to let it touch the water. So the counter C is fast to get the line and sufficiently upstream to have space for adjustments. All of this is a perfect balance of speed, accuracy, strength and fast feedback.
The last shot, the back one, is a very good example to look at the symmetrical theoretical set of the line. There are all the space needed and I’m casting straight in front of me. In the last cast when I want to cast upstream, I just set up the line just upper and without moving myself, start an upper cast from the new anchor.
In this cast, the most important is to cleanly reverse the line with the C move to be able to free it up from water stickiness. Your goal is to find where to start it up to be able to finish where the fly must be. It’s the basis of everything as any move will have an impact on the final. It is the butterfly effect, if you go downstream your fly will be closer if you go upstream your fly will be farther. Remember for each anchor there is only one cast. So play with the C, make it rounder or longer or shorter but find the right one.
By the way, remember to always come back to the ideal practise length of line, it’s the only right thing you can measure without error in any condition.