He told the police sergeant, as he knew he would, that he would leave right away and help however he might. The address he wrote down was familiar to him. It was in the Flats, an old Holyoke neighborhood or section of the city once inhabited by many different ethnic groups, although now almost exclusively Puerto Rican. He shoved the paper with the address in his coat pocket and found his little black bag with the oils and other implements for giving what once was called the last rites of the church, but were now termed the sacrament of the sick, and headed off in the direction of the Flats. Sixty-six Center Street. He’d been there before, he was sure. Only the week before, the adjoining block had burned up. It was another of those…