My trainer took my 6 year old, new-to-me mare to a clinic a year ago. AH does several clinics a year near us. My mare was fairly green, more like a young five year old in her training. So we were really just working on installing the basics and foundation for her career, such as learning about half halts. We were not looking to achieve Pi/Pa, but to introduce her to maintaining activity behind, and bringing her hind legs under herself. She was still building strength and balance in her daily training.
On the lunge to warm up, he was very happy with her gaits and way of going. He liked her very much, and her breeding. When he first began to work with her, he noted that she was bargy, and needed to have better ground manners, respect for personal space and obedience. All true. Did several ground exercises for that. (She will still try to be a ‘space invader’ if allowed to do so; I believe she was permitted to be a pocket pony in her younger years before I had her.)
Then, he worked her in hand to ask her to move her hind legs in response to a tap of a whip, looking for her to step up and under herself. He allowed her to have an opinion and was quietly insistent and consistent, with liberal praise and a walk break when she tried.
He did a small amount of work under saddle. She’s a smaller horse, 16.2. He has a different build (and weight) than my trainer (or myself!); he noted that she was tired so he did not ask her for more new work. But she got to feel a different person/weight/build and find her balance with his assistance. He did say that my horse would be able to do the higher level work without difficulty, and advised not to rush her. He again praised her gaits. (Proud mom moment.)
I would have brought her back for the next two days (a 3 day clinic), but had a sizable vet bill with my other horse, so my wallet did not allow.
Much of his skill, IMO, is his preparation and timing of cues and rewards. Also in giving the horse time to process what was being asked, while he walked her around the arena for breaks between exercises. I enjoyed his work, and felt he was fair and sensitive with my youngster. Even as green as she was, he gave us a peek at what was possible for her future, and gave us several effective exercises to work on at home.
AH was just here at the same facility, and my trainer brought two other horses, much more advanced (GP and I-1). I had to work but would have audited if I could have!