The boy sat alone at a table in Courtroom 304 Friday, swiveling his chair slightly with his head lowered to one side.Dressed in a green jumpsuit and sandals with ankles chained, 14-year-old Vincent Wayne Leodoro thumbed through the juvenile court petition in front of him. The judge entered the room, and after everyone took their seats, asked Leodoro's mother, Rene, to join her son at the table. She slowly walked to her son and sat close to him.The arraignment continued as Circuit Judge Pro Tem George Ambrosini read the charges filed against the juvenile: attempted murder, first-degree assault, possession of …