A prisoner distraught at losing his appeal violently banged his head against the bars of the dock in court yesterday. Mo Shiu-shing, 37, was taken to the cells and was not fit to continue with the second part of his case, an attempt to have his sentence reduced. His reaction to the Court of Appeal ruling came a day after a hawker set himself on fire at North Kowloon Court when a magistrate ordered him to surrender his goods. Mr Justice Michael Stuart-Moore said the court had rejected Mo's appeal in a ruling which set new guidelines for judges when advising juries about alleged lies told by defendants. Mo, who is serving a 7.5-year sentence for turning his flat into a centre for producing fake bank notes, reacted to the news by repeatedly striking his head against the bars in the dock until prison officers intervened. When the judges returned after a short adjournment, Mr Justice Noel Power said Mo was not fit to continue and the question of his sentence would be considered at a later date.