Stewards suspended four riders for careless riding and were forced to adjourn an inquiry into a fall that left Keith Yeung Ming-lun hospitalised, while another future hearing will focus on a pre-race positive swab to a feed supplement.
Three riders had already been declared unfit to ride before the meeting - and that was before news of the positive swab broke and a non-runner declared after being denied a fair start, but even more drama came in the final race when Yeung was dislodged from the Almond Lee-trained Chok Chok and fell heavily.
Chok Chok was later euthanised after being squeezed for room and clipping heels at the 150m in the Long Ke Handicap, causing the gelding to crash to the turf and spearing Yeung into the ground with him.
Yeung remained in hospital last night with a fractured left collarbone and the hearing will take place when he is able to attend. Evidence was taken from Vincent Ho Chak-yiu (Mighty K), Neil Callan (Go Go Win) and Douglas Whyte (Holmes Legend).
The expected prolonged absence of Yeung may put pressure on a riding roster already depleted by a slew of injuries and suspensions, which stewards added to on Sunday with careless riding bans dished out to Eddy Lai Wai-ming, Neil Callan, Umberto Rispoli and Karis Teetan.
Lai was given four meetings - an extra day on top of the now standard three days - after stipes ruled his riding on race two winner World City exhibited "a high degree of carelessness."
Callan was charged for not leaving sufficient room when crossing on Good Smile in race one and Rispoli received the same charge for his effort on Pretty One in race eight, both will begin their three day bans after Sunday's meeting.
Teetan - charged for his ride on Dehere's The Love in race nine - already had a pending three-day suspension beginning after Sunday and won't return until the Chinese New Year meeting on February 2, missing possible Group One rides in the Classic Mile on January 19 and in the Kent & Curwin Centenary Sprint Cup a week later.
Earlier in the day, Michael Chang Chun-wai-trained Good Directions was withdrawn from the Sai Wan Shan Handicap after a urine sample showed the presence of the prohibited substance Methylsufonylmethane.
The sulphur compound is found in a number of authorised feed supplements and is able to be used with restrictions up until raceday. Evidence was taken from Chang and the matter as adjourned to a date to be fixed.
Stewards were also forced to declare Crimson Heart a non-runner in the Griffin Trophy after the horse put his head to the left moments before the start of the race and, despite the efforts of Teetan and the barrier attendant, was unable to be straightened in time.
