Sven rounds from a S&W 686+ would, I think, have decided the issue.
One hit from a 1911 would have been better.
Of course, a single hit from anything is better than 30 misses. However is there any information about how many times the murderer was hit? If trying to keep him pinned down, the more the merrier, when it comes to shots fired. Though the use of "covering fire" isn't a good doctrine to be using in a civilian area.
But I agree, a more potent round would have been better. But if that's the round she's most comfortable with then that's what she should be using. The Bererra is a relatively large and heavy handgun for a 9mm, making it relatively easy to shoot (though some women and men with smaller hands dislike the wide double stack mag well grip).
Does Sven have to be holding the revolver?
More so than 10 9mm rounds, but I don't really want to start that argument. I'll compromise by saying it's where you place the shots, not the caliber or power of the cartridge.
Ole shoots a S&W; I thought Sven shot a Ruger.
or just 1 from a 629. :)
I suspect that you are in the brick masonry trade.... 8~)