She thought of a story she’d never told anyone: the time she’d stood at the edge of a platform as a teenage boy stumbled backwards into the tracks. She’d seen him fall. In the moment she’d screamed and reached and then blacked out, hands grabbing him and lifting. The saving memory was panicked and precise—the toothpaste on his lips, the smell of rainwater—and a failure that tasted like copper: she had never told the family what she’d nearly lost, nor had she allowed herself to be recognized for the small heroism she performed without seeking credit.