A FORMER nurse told yesterday how her 'violent and crazy' lover forced her to take part in a bizarre revenge attack on his ex-girlfriend. Wu Pui-kwan, 46, said she went along with Lau Kin-hung's plans because she feared for her life after he beat her up and threatened to kill her. The couple allegedly kidnapped Lau's former girlfriend Chow Sau-ling, 24, after pouncing on her in a lift and knocking her out with chloroform. Defence counsel Thomas Iu told the High Court jury Wu was completely under the influence of Lau, 38, who had crushed her will with his repeated violence. Wu, who worked as a nurse in China during the Cultural Revolution, admitted she had obtained the chloroform from old student friends during a trip to the mainland. But she claimed Lau, who has a previous conviction for violence, told her he wanted it to make a solvent to repair his stereo. The former nurse also described how Lau took her on numerous trips to Ms Chow's Yuen Long flat in the weeks before the attack. But she said she dared not ask him what he was doing out of terror he would beat her again. She told the jury: 'He said the girl had once reported him to the police. He hated his ex-girlfriend and wanted to take revenge. He said he would set fire to her premises. 'He said he would shoot her with a pistol. All along he kept mentioning he would kill the girl. I dared not ask the details.' Asked why she had gone along with Lau, she said: 'I had no alternative but to comply with his instructions because he was very fierce. 'He said if I interfered he would kill me first. I felt very frightened.' Wu, who was born in Shanghai, said she started an affair with businessman Lau after he came into the karaoke bar where she worked part-time. But the relationship became violent when she suggested they split up. On one occasion he beat her up when she refused to buy his lunch. On another she claimed he kicked her in the face when he did not like the way she played a video game. Both defendants deny kidnapping Ms Chow and administering chloroform with intent to kidnap her on February 22 last year. The trial continues.