A secondary school pupil in Hong Kong has been seriously injured after having his face gouged with a pen during a fight with a fellow pupil on campus.The secondary section of Rosaryhill School on Stubbs Road in Happy Valley called for an ambulance at about 12.40pm on Thursday after a 16-year-old Form Three pupil was injured on the left side of his face during a fight with a Form Two student, 17, in a changing room, a police spokesman said.The incident was related to a quarrel over eye contact…