A woman notices a man in distress who is losing his balance. She triggers the SOS alert before he even falls, and is the first to rush to his aid.

CCTV footage from a subway station shows a woman who immediately notices a man losing his balance near the edge of the platform. Her immediate reaction: she triggers the SOS alert. It was too late to prevent the fall, but her quick action allowed the man to be rescued within seconds, even before official emergency responders arrived