Variables that I would consider are, split time between each round, and the fact that hard plates have no back face deformation. Additionally, intuitively I feel that there is substantial energy lost by the round fragmenting, rather than being delivered to the wearer of the plate. Plus, read stories from guys who took hits on hard plates, so in most cases, probably not.
I was talking of soft armor, and, for the record, I said I was pretty sure. I've seen several patrol car videos of guys taking unexpected hits from pistols. In the totally unaware cases they seem to stagger and then continue.
My thought was that if they stagger momentarily when being struck with a pistol round that has approximately 1/3 the KE of a slug, stumbling backwards and perhaps falling when hit with a slug isn't unthinkable.
That being said, a guy prepared to take a hit is a different matter. I've talked with guys who took pistol rounds during entries, not a pause.
A lot of variables, but again, intuitively I think most folks would probably stumble back and fall.
The KE numbers involved would lead us to believe that the guy should be flung through a plate glass window like in a movie, but we know that isn't the way it works.
For now, I tired of being beat upon, so I'm taking a break. Semper Fi.