It's still IIIA Kevlar. Won't stop a rifle, but it'll stop a handgun.
A bullet to the headgear would have rung his gong like a cymbal, though. Might have knocked him down, or even knocked him out. A bullet through his throat sideways would have ruined his day, as well; or one through his ear. A bullet in his groin or upper thighs would have crippled him, if not stopped him completely.
But nobody had a pistol to try any of that, and apparently, nobody had a knife or the will and skills to use one, either.