One evening a few weeks ago, Lisa Rayford was sitting in her living room when she heard a struggle just outside. Typically the 49-year-old wouldn’t investigate, but the commotion was unsettlingly close. On her lawn, chaos: A man had pinned a woman down in the grass, his hands wound tightly around her throat, Rayford said. Nearby, a young boy lay on his stomach, watching. She recognized the mother and son from the neighborhood.