Calvin Saward , the next four weeks , grabbed a knife to confront gang outside Kent home . But father disarmed him before fight could take place and called police . Judge orders Saward to stay indoors overnight for 18 . Teenager posts picture on Facebook of his electronic tag after the case .
Calvin Saward , 18 , grabbed a knife to confront gang outside Kent home . But father disarmed him before fight could take place and called police . Judge orders Saward to stay indoors overnight for the next four weeks . Teenager posts picture on Facebook of his electronic tag after the case .