I'm not sure whom the, 'us', refers to in your case. But I will give it one try for you.
Early, in the worst
shoot-out the FBI ever had, an Agent shot a Creep in the ribcage with a 9mm from a short distance. The bullet, while on the correct target path and with sufficient velocity, deformed and stopped before the bullet traveled thru to the Creep's vitals. Said Creep continued his attack despite soaking-up his new less than lethal gunshot wound to his chest.
The official FBI shooting review concluded that had 9mm been loaded with a bullet capable of decent penetration the Creep most likely would not have had the energy to kill, and injure, multiple Agents, shortly after the intial hit.
Reflecting on the tone from your request for this 25 year old open-source information, I am certain that others, whom may know more about the Dade County Shooting than me, will gladly fill in the details if you so desire.