Watching this today noticed at the end of Frederic Wandres’ ride he appears to take something off of his right spur and tuck it under his hat.
It’s at 54:47 https://www.youtube.com/watch?v=TJ6ITzWcM3Q
This has some fabulous rides (an this one was nice too -I and like the horse!) but I’ve never seen anyone do something like that before. He does seem to have left a patch of unclipped hair around the spur area on both sides so maybe it’s to do with that? But it’s just odd.