“Stay with me,” she whispered to him, as if they’d been lifelong friends. “I’m staying right here. They said you need twenty minutes.”

Helen, trembling, fumbled for her phone to call emergency services. She kept stealing glances at her daughter, stunned by the calm authority in Sophie’s voice as she tilted the man’s head to clear his airway and maintained steady pressure on his chest with uncanny precision.

“How do you know this?” Helen asked, her voice shaky.