The turn on the haunches first shows up in Second Level, but it's a movement that you see again and again as you move up the levels. When we first started the turn on the haunches, I didn't really understand its role in the grand scheme of things, but I am starting to really see its value.
Since that went so well, I decided to use the pirouette in an exercise Chemaine had shown me a few weeks ago: walk pirouette to canter. Essentially, it's the same as doing a simple change of lead through walk, but with the added collection of the pirouette. Just like when we did it at the trot, Speedy's canter depart was crisper because he had his hind legs underneath himself.
As we crossed the diagonal in canter, instead of asking for the change, I asked for a balanced canter-to-walk transition, and then moved straight into a walk pirouette. I did that several times, but on the next diagonal, I asked him for the flying change instead of the walk transition. Viola, much improved. Instead of rushing or getting stuck, he jumped into the new lead cleanly.
Walk pirouettes. Who knew they were so handy?