The aim is for your dog to respond to the visual or verbal signal alone, from a distance:
From a distance
Make the “pistol” signal from 1 metre away while giving the verbal cue.
Subtle help
If your dog hesitates, help them with a slight movement of your head or shoulder.
Reward from your pocket
Reward with a treat that comes from your pocket once your dog is properly down on the ground.
Building duration
Gradually increase the time your dog has to stay “dead” before you give the reward.