Operation of the machine can’t be all that bad, as the video shows a horse coming back to eat after ‘treatment.’ Most of them probably did the same thing, so it was hard to choose the right clip for the video.

Do you think the user of this equipment will want darted mares eating more of the bait, when there is so much need out in the pasture? Do you think said user will be willing to feed the studs when they come in for a bite?
Hell no!
There must be another feature in the machine that drives the animals out after they’ve been treated or deemed unnecessary, such as an electric shock.
POW! Hit ’em with a dart. Then ZAP! So long sucka!
