Over-use of the leg-yield can have a negative effect on a horse's training, causing them to lose the all-important forwardness, and may cause short, broken gaits.
I know already, by your forwardness, that you have deserved rewards and crowns; and we do assure you, on the word of a prince, they shall be duly paid you.
Please forgive my forwardness but this incident has made me very angry because three men now need to recover and heal as well as what is unseen, and unstated.
Rushing the horse at a cadence exceeding the horse's natural frequency, stiffens the back muscles, altering their precise orchestration and therefore, forwardness and balance control.