stew King and moss fell on first circuit at Aintree on penalties . Balthazar King needed veterinary surgery on the course after the fall . Ruby Walsh acted as flag bearer to warn moss to avoid the crash .
Balthazar King and Ballycasey fell on first circuit at Aintree on Saturday . Balthazar King needed veterinary treatment on the course after the fall . Ruby Walsh acted as flag man to warn riders to avoid the horse .