At the kennel, we had a long overhead line stretched out that ran past the INVITING opening to the passage to their kennels. It worked well for forcing back and debolting because the dogs had to run past that nice, inviting, open, kennel door that led to their nice, safe and cozy kennels. There was a tremendous temptation for the dog either inroute to the pile or coming in under duress to bolt for the safety of his kennel. The trolley kept him on a line and only allowed the dog to go two directions: away or to you.
If the dog chose away, he'd hit the end of the trolley, jump and spin while you burned him, and finally come in in heel, his only safe place. Same on going out. When forced inroute or from the side, the dog only had one way to turn off the juice, and that was to get a bumper in his mouth. Initially, the force back was begun with a stick or buggy whip, then the collar added.
Now, usually debolt and force back would be accomplished at the same time if you put enough heat on the dog, but if not, the debolt was done like this: You'd sit the dog at the end of the trolley and command HERE, burning the dog. On the way in, if he veered off route you'd nail him again and command HERE. Once he was 100% on the trolley, you'd take him off and proof him the same way.
In California, we used to force and debolt probably 300 dogs a year using this system and it was foolproof.
I hate seeing a game bird die of natural causes, unless I naturally cause it.