One theory is that they are materialized angels or somebody who learns of a tragedy, travels over to help, then leaves. Stories of human-form angels appearing, offering help, then vanishing, are a core part of spiritual folklore and modern testimonies. They are often called “unaware angel” encounters, referencing the Biblical concept of humans entertaining angels without knowing it. “The Stranded Motorist” event involves a woman driving alone on a deserted highway at night during a severe blizzard. One of the most interesting “unaware angel” encounter stories was related to me years ago.