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