The EA Show Horse Committee would like to clarify rule 1.1.15, is in respect to the remainder of the event, not just the one class.
1.1.15 In the event of a fall by horse or competitor, it will be the decision of a representative of the judge or the organising committee, (informed if necessary by a doctor or medical officer in the case of a rider or a vet or horse welfare officer in the case of a horse), as to whether the rider or horse can continue to compete at the rest of the event.
Full rules can be found located here.
Article courtesy of Equestrian Australia