Three jockeys miraculously escaped without any life-threatening injuries after a shocking fall at Happy Valley last night. French rider Eric Saint-Martin later pleaded guilty to careless riding in the race four accident and was banned by the stewards for seven meetings. Alex Yu's mount in the Wah Fu Handicap, Healthy Bobo, clipped the heels of Saint-Martin's mount, Grenadier, passing the winning post the first time and Eddie Lai (Winning Supreme) and Weichong Marwing (Dragon Win) crashed over the top of him, but only Yu emerged injured to any great degree with a dislocated left collarbone and a broken bone in his right knee. Pandemonium reigned as club officials flooded the track while the field continued to race along the back straight. With the stricken riders strewn across the track and unable to be moved, lights flashed and the officials frantically waved flags and arms to ensure the approaching jockeys did not continue. The event was later declared 'no race' and more than $82 million in bets refunded, but Jockey Club officials breathed a sigh of relief when it was announced no rider was more seriously hurt. The fallen riders were conscious but Yu was on the track under medical attention for some time before being stretchered into an ambulance and then away from the course. Lai was soon sitting up and in contact with his family by telephone and Marwing walked back to the jockeys' room. Yu was rushed by ambulance to Queen Mary Hospital at Pok Fu Lam, where officials said the initial X-rays and diagnosis were positive, while Lai and Marwing remained at Happy Valley. Marwing had requested he be allowed to continue riding but, with the Club doctors kept busy attending to Yu and Lai, stewards were unable to clear Marwing for the following race. He was subsequently cleared after the fifth race but medical officials rethought the decision soon after and Marwing was stood down and was reportedly suffering minor headaches. 'It is a risk management issue and we don't know if Marwing is suffering some kind of shock, so it is better he does not ride again tonight,' said Jockey Club executive director of racing Winfried Engelbrecht-Bresges. Lai left the course limping from an injury to his right leg but was otherwise reporting himself fine. Yu's mount Healthy Bobo was the first to fall 50m after the winning post on the way out of the straight the first time as he drove his mount through inside Grenadier. 'Eric was very open with us at the inquiry and said he looked, then looked again, and Alex was not there, but as he moved inwards Alex drove Healthy Bobo through into the gap and clipped heels,' Engelbrecht-Bresges explained. The ban on Saint-Martin is effective immediately and will take him out of action until the Sha Tin meeting on December 5. Eric Legrix injured a knee at yesterday morning's barrier trials and was already a scratching from the meeting and with three more jockeys stood down, riding engagements for the remaining six races were thrown into confusion. The nasty fall took attention away from the action that followed and Gerald Mosse's first winner for the season was buried as a result. Mosse, who arrived almost a month ago to be retained rider to Brian Kan Ping-chee, finally racked up his first win - but not for Kan. The Frenchman darted through on the rail in the final event to win on Natural Winner for Tony Cruz, defeating stablemate Turbojet. Interference in the Oi Man Handicap was not enough to stop Romantic Venture scoring at big odds for apprentice Way Leung and trainer Geoff Lane. The six-year-old was run off the course on the back straight but managed to recover well enough to surge down the outside, putting some spice into the big Triple Trio.