The WSJ enlisted a stunt double to test the Fall Detection features of the Apple Watch Series 4.
How does Apple Watch Series 4 Fall Detection Work?
If Apple Watch Series 4 detects a hard fall it taps you on the wrist, sounds an alarm, and displays an alert.
You can choose to contact emergency services or dismiss the alert by tapping I fell, but I’m OK or by scrolling down and tapping I did not fall.
If the Apple Watch detects you are moving it will wait for you to respond and won’t contact emergency services but it you do not move for about a minute it will start a countdown to call emergency services with an alert getting louder and louder.
After 15 seconds if you do not respond it will contact emergency services and message your emergency contacts.
Image Source: Apple