The third herd rule is "move when I say move" which also means "wait until I say move" Whether trying to mount a riding horse or climb aboard your carriage, having a horse that waits until you ask her to walk off is much safer and more enjoyable to be around. Note I stop her, then throw her slack.
If she is free to move she is more likely to
want to stick around. Many people have trouble because they try to
"hold the horse still." Releasing helps the horse understand that you
want her to stand.
