That looked pretty slick. Sure appreciate you posting that video. If your wife doesn't mind, I'd definitely watch more, just to see it done on different animals that may handle differently.
I'd always assumed that roping them to doctor them is harder on the animal than putting them in a head gate, but I don't think that way anymore, as I learn about these types of techniques. Besides, trailing them to the nearest headgate might be a lot more stress if they are in tough shape. Our cows are fairly quiet, so hopefully there isn't a whole lot of running them down in order to get a rope on them.
Got myself a 50' rope, so I might give it a whirl one of these days. Bought a dart gun too, so I guess I have options.