Lesson learned... Despite using the least appropiate type of ammo (FMJ) in a low-weight variety (115gr) and a caliber despised for allegedly lacking stopping power (9mm), a torso hit close enough to the heart will bring a BG down quite quickly.
The caliber "despised for allegedly lacking stopping power" isn't so despised when effective ammo using better technology is used. Translation: Don't blame the caliber. Blame the ammo mandated by horses' fanny bureaucrats.
Every one knows that shot placement is the key factor. There isn't any argument in that regard, and it gets repeated with great regularity on every thread that talks about "stopping power" issues. But ammo choice is important, also. An assailant can fail to go down even when fatally shot with ball ammo. Less likely to happen with reliable HP's.