Third man syndrome - Why Your Brain Makes You See This If You're About to Die

Grappling with a near-death experience, you are calmed down when a kind soul decides to help you, aiding in your rescue. When the authorities arrive, you turn around to thank them, but there’s no one there. Sounds familiar?

The third man syndrome is actually a shared human experience, where an invisible entity is there for support and guidance in dire situations. So, why is this such a common theme? How did people experience it?