I will disagree. A correctly fitted halter will work very well3. Longeing Cavesson. You have no control longeing in a halter. They can whip the head around and they are gone. A longeing cavesson applies pressure to the sensitive nose. A horse hits the end of that and they'll usually think twice about trying it again. The term is called 'leverage', and right now, you've got none and he knows it.