Being within the Killer's Terror Radius while not in a chase for 40/35/30 seconds activates Diversion.
Once Diversion is activated, press the Active Ability Button 1 while crouched and motionless to throw a pebble, which creates a distraction for The Killer at a distance of 20 meters.
The perk timer resets once the ability has been activated.
The distraction consists of:
A loud noise notification
Scratch marks