Inside the overturned ambulance, nurses shielded the newborn with their own bodies as glass rained down and metal twisted around them. The baby’s fragile cries, astonishingly, meant life — a sound that pushed paramedics and bystanders to claw through the wreckage faster. Strangers formed a human chain along the highway shoulder, passing equipment, holding flashlights, and offering shivering survivors their coats in the cold glare of emergency lights.