“Trainers” and riders can get away with stuff at bush meets that they can not get away with as easily at recognized meets. Because there is less money involved, there is less surveillance, and less officials employed, and a variety of things may be done in a less than professional manner. I have purchased several horses who were “machine horses” (I heard) as sport prospects. The buzzer is held by the rider in his hands, with the reins, the buzz is delivered to the crest of the neck. I’ve never seen one myself, but this is what I have been told. I found that pulling the manes on both of these horses elicited more response than you would think would be normal. I have never been one to do a lot of clipping, but it is possible that clipping may have the same response from a horse with this history. One way or the other, it’s not a big deal, and tends to go away as the horse gets to understand that he is not going to be “plugged in” again, by you, for some reason that he does not understand. But the horse has a history that you need to take into consideration when working with him.
“Plugging a horse in” (shocking him with a battery operated stinger) is done by “trainers” with little understanding of the equine condition, IMO. It is an “old school” practice. Progressive trainers want to make the racing experience as positive and fun for the horse as possible, to engage the horse in the sport. Good trainers want the horse to squeal with joy as he goes to the paddock to be saddled, and wants him to WANT to be a racehorse to the best of his ability. Electric shock during the process is counter productive to this. So “true” horsemen don’t engage in this practice, obviously. When it is done, or has been done, it is done by people who are in a desperate state, trying to “make” the horse run from fear and pain. Not condusive to a long term view of successful horse training.
So that was the meaning of the crack about these low level trainers and what may or may not go on at bush meets. Buying a horse from such a situation can often be considered an “upgrade” for the horse.