What does Warwick Schiller say about a horse that rushes off the moment the rider mounts?

Warwick Schiller addresses the horse that rushes off immediately after mounting in the context of his broader teaching on nervous system activation — and his diagnosis is that this horse is in an activated state before the rider's foot ever goes in the stirrup, and that the mounting is simply the trigger that releases tension that was already building. His first observation is that a horse that rushes off when mounted is almost always a horse that shows other signs of activation before mounting: elevated head, tense topline, short choppy steps when led to the mounting area, lack of genuine stand at the block. The rushing off is not caused by the mounting — it is the expression of a nervous system state that was present before mounting began. Schiller's solution works backward from this understanding. Rather than correcting the rushing-off after it happens, he works to address the activation before mounting by spending more time in the pre-mount preparation — not formal groundwork necessarily, but quiet time near the mounting area, allowing the horse's nervous system to settle before any mounting attempt is made. The processing signals — licking and chewing, a lowered head, soft breathing — should be present before the rider gets on. For the correction after the fact, Schiller agrees with Anderson's one-rein approach: immediately pick up one rein and disengage the hindquarters the moment the horse moves without direction, bring it back to the mounting position, and stand again. But he emphasizes that this correction addresses the symptom — the horse gets correction for moving — without addressing the cause, which is the activation state. Both must be addressed for the behavior to genuinely resolve.