Stoeger sets up 3 targets at 10/15/20 yards or further.
Load at least 8 rounds in the gun. At the beep, raise the gun and fire 2 pause slightly and repeat till the mags empty.
The pauses are so you can see the pairs in the string on the timer.
Stoeger wants you to practice this at your realistic match pace that gives 95 % A hits.
Reload with 8 and engage each of the next targets the same way.
Once you get the hang of the drill start looking at what the sights are doing, experimenting with grip pressures and such.
The goal is 90-95% As and match pace splits at each distance. The focus is on the splits: the draw, target transitions, movement etc, are addressed in different drills.
Very useful drill.