A University of Hong Kong student was bound over yesterday in Eastern Court for a year for assaulting his ex-girlfriend. Prosecution dropped the charge against Kwong Tze-shun, 21, of assault occasioning bodily harm. Kwong had been dating Ginny Tai Hang-yi since last year, but the pair split up in January this year. During an argument on February 2, Kwong hit Tai's nose with his head.