Last updated at 2.37pm: A off-duty senior police officer told a court on Friday how he was attacked by the son of Nigeria's top envoy to Hong Kong outside a Wanchai bar, seconds after telling the diplomat's son to behave himself. Chief Inspector Michael Armstrong told the District Court he went to the Devil's Advocate bar in Lockhart Road on February 3 to continue chatting with colleagues. They had earlier attended a supper gathering at the nearby police headquarters to celebrate the work of the 18th century Scottish poet, Robert Burns. Mr Armstrong told the court he decided to go home at around 5am and went outside to get a taxi. While he was waiting outside he saw that the diplomat's son, Oluwaseni Olusanmokun, 20, was exchanging abusive words with a group of four or five people, the court heard. Mr Armstrong said he asked Olusanmokun to keep quiet and behave himself. The Nigerian man responded by swearing at him and struck a blow at Mr Armstrong with a stun gun, the court was told. Olusanmokun denies one count of being in possession of a stun gun without a licence and one of wounding with intent. He has been remanded in custody. His co-accused, Derek Xavier Christiaanes, 19, denies one count of obstructing a police officer. He is out on bail. The hearing before Judge Fergal Sweeney continues.