A BLACKMAILER paid for his crime when he lost an eye and his face was terribly scarred, the District Court heard yesterday. The mother hurled acid at Tsang Ngai in the family-owned medical clinic after he hit her daughter, a nurse, over the head with a beer bottle, the court was told. Acid burns left the 26-year-old disfigured and blind in one eye. On May 27 last year, Tsang and Li Kim-fai, 22, went to the Hang Seng Medical Laboratory in Mongkok. The two men requested blood tests and after their samples were taken by nurse Wong Yu they demanded the test results the same day, prosecutor David Tolliday-Wright said. At first, the nurse told them it was impossible, but then relented and rushed the samples through to the laboratory. Tsang and Li paid the clinic $1,400 and left. The next day they returned, saying their test results were invalid and demanded $16,000 compensation, threatening to call others if the money was not paid, the court heard. When Ms Wong ignored them, Tsang hit her over the head with a beer bottle, knocking her unconscious. The nurse's father, Wong Chung-ching, saw his daughter fall and rushed to her side. Tsang swung his bottle at the father's head. The two men then closed in and began kicking and punching Mr Wong, just as Ms Wong's mother entered the clinic. She instinctively ran to protect her family and was punched by both Tsang and Li, Mr Tolliday-Wright said. Mrs Wong grabbed a container of sulphuric acid from a desk as she shouted for help. She then threw it over her attackers and the two men fled the clinic for the Prince of Wales Hospital emergency ward. The acid left Tsang hideously scarred and blind in one eye. He pleaded guilty to wounding and blackmail while Li admitted wounding. Judge Caird adjourned sentencing until May 11, pending background and medical reports.