DOCTORS at Queen Mary Hospital are battling to save a Hongkong University medical student who was knocked down by a China Motor Bus vehicle near the hospital yesterday. Police said Mr Fong Kin-chou, 22, was crossing Pokfulam Road when he was hit by an Aberdeen-bound Route 94 double-decker bus just after 1.30 pm. Witnesses said Mr Fong had just got off a minibus and was crossing the road when he was hit.