The Guardian Angels, who have been patrolling Green Line trains since last month’s large brawl, detained three men who were fighting Friday night. According to John Unique Ayala of the Guardian Angels, three men were observed arguing at the Navy Yard station. The argument escalated into a fight onboard the train, at which point a Guardian Angels patrol intervened. The patrol detained three men in their 20s until Metro Transit Police arrived at L’Enfant Plaza Station. Transit Police took one of the men into custody for simple assault and disorderly conduct.