I watched it without sound and what I saw was a lot of positioning for maximum visibility through the bends. I try to practice that but positioning for left hand bends (RH if you drive on the Right) make me nervous as it puts you very close to oncoming traffic. I noticed he raised that point and when he observed oncoming traffic through the trees he compromised the extent of his positioning and gave a bigger margin. It's along time since I did any driver training but the essence of it is looking as far into the distance as you can and using the best positioning to make that possible.