Harmony herbicide

Recently talked to a guy at the hay auction and he told me you could use Harmony on mixed hay, Alfalfa Orchard Grass mix. He said not the harmony extra but the straight Harmony.. I'm always looking for a herbicide for mixed hay . I checked the label and even thinking about after label I can't see how this could work anybody here know anything about it or ever use Harmony on Hay

Harmony herbicide