A TEENAGER sprayed insecticide on a 20-year-old man and burnt a lock of his hair in a dispute over a friend's watch, the District Court heard yesterday. Choi Cheuk-kwong was subjected to the ordeal after his unemployed friend Tsui Siu-kin, 19, asked him about the watch and questioned him about a debt on April 9 last year. Another person, delivery worker Tong Yung-fai, 19, told Mr Choi to go to the home of Lam Kai-yuen, 18, in Sha Tin. Mr Choi reluctantly followed Tsui and Tong where they were joined by two others. Mr Choi told Tsui he had pawned the watch and testified Tsui hit him and told him to pay $5,400. Lam also struck Mr Choi with his fists twice. The prosecution alleges student Chow Chi-ho, 15, made an abortive attempt to withdraw money by using two bank cards belonging to Mr Choi. The court heard factory worker Ip Kwok-hang, 15, then arrived and hit Mr Choi. Mr Choi was kicked by Tsui, Lam, Ip and Tong before Tong burnt his hair and sprayed insecticide on him. Tsui then demanded $9,000 from Mr Choi's father and arranged to meet him later that day, when the money was handed over. Tsui and Tong both pleaded guilty to a count each of false imprisonment and blackmail. The pair along with Lam and Ip admitted a joint count of assault occasioning actual bodily harm. Chow has pleaded not guilty to the three charges. Chow alone denies two charges of theft. Deputy Judge Muttrie adjourned sentencing on Tsui, Tong, Lam and Ip until May 31. The trial of Chow continues today.