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because of any pain, but by a pleasant relaxing of the jaw. If along with this, the rider, by the effects of his legs, concentrates the animal's forces so as to bring the center of gravity under his seat, he establishes a control from which the animal cannot escape. But it is not by jerks and saccades that the horse comes to understand the effects of bits and legs.
Nevertheless, if the horse, taking contact with the bits, hesitates to yield the lower jaw, some vibration of the snaffle rein may be needed to relax the mouth. But vibrations and jerks are two different matters. The one is beneficial; the other is useless and dangerous.
