Let's improve my personal firearms proficiency a bit.
Also, the Banshee is his secondary weapon. With a Hitotsu-monji in one hand, many times it would be necessary to shoot with the unconventional left hand.
This added another layer of difficulty to the training.
...
Triple Volley.
Actually, it's a matchlock gun tactic that emerged in the 16th century, to compensate for the slow firing rate of guns which couldn't fire continuously at that time.
Oda Nobunaga played this matchlock gun tactic very well during the process of competing for supremacy in Japan's Warring States period.
It's pretty much the same as the European firing line execution.
Three people formed a group, with the front gunner shooting first, then retreating to the back to focus on loading ammunition, followed by the second soldier stepping forward to fire.
The three would alternate loading and firing.
