Part of table 2 for USMC rifle qual., is a "failure-to-stop" drill. Put two shots in the chest, another incapacitating in the pelvic girdle, or "T-box" (ocular and nasal cavities). This is to simulate an attacker at close range (5 yards), that won't go down with normal " kill-zone" shots.
For score, and for practical application, the pelvic girdle is an easier target. It's much larger than the T-box as mentioned above, and you merely need to shift your aim down. If you miss the pelvic girdle, you will still likely be hitting the torso, and causing fatal injury.
The FTS (failure to stop) drill, would often be incorporated into what is called a "box drill", which was to simulate multiple attackers. Two targets. 2 shots to the chest on one, use the recoil from that second shot to help transition to next target. 2 shots to that chest. Here they might have you drop to a knee, regardless, fire an incapacitating shot to the 2nd target, and then the same to the first.
With a little practice, you can become surprisingly fast. The above is often qualified for, on the same day you get to practice for it. Using a carbine at that distance with a fixed power optic, is more of a hindrance than if done with a pistol.
That gun club seems to think it has merit. I will say in my personal opinion, light that target up until it's no longer a threat. Nothing suppresses or eliminates a threat, like swift, violent actions. Especially in the form of overwhelming fire
