A part-time swimming instructor faces life behind bars for trying to rape a schoolgirl in what the judge described as a 'particularly disturbing' case. Choi Lin-cheong, 37, was convicted of indecently assaulting and attempting to rape the girl in her family's Sha Tin flat. He had talked his way in with an invitation to join a swimming contest. The girl, 15 at the time, told the Court of First Instance she was threatened with a blade, tied up, gagged and forced to perform sex acts. Mr Justice Frank Stock said the case was 'particularly disturbing'. He was considering a life sentence due 'not only to the planning and execution of these offences and their nature, but also his conduct subsequent to the commission of these offences'. The court heard Choi, a technician, gave the girl a swimsuit to try on. He grabbed her as she emerged from the bathroom. The victim's mother came home during the attack. She struggled with Choi, who slashed her hand. The girl said Choi left the flat only after her mother promised not to scream. Choi was also convicted of wounding the mother. He had denied all charges. Mr Justice Stock said he was disturbed Choi had made phone calls to the girl's home after the attack, committed on December 18, 1996. Sentencing was adjourned to November 13 for a psychiatric report. Choi was remanded in custody.