The author was talking about defensive rounds. He was saying how a 25 auto is compact to carry but anemic.
Anyway, he referenced where a perp was holding up a victim. The victim didn't move fast enough so the perp shot him in the head.
The bullet went into the victim's scalp but didn't penetrate the skull. It just zipped around the scalp along the contour of the skull.
The victim was treated and released with no more than a really bad headache.
I wonder if Clint would go for a satirical remake of the Dirty Harry films, with a .25 auto Raven or something. He's popping perps and hitting them every time, and they're flinching and saying "OW DAMMIT! KNOCK IT OFF!" everytime he connects with a shot. :-)
All kidding aside, I had an acquaintance when I was about 18 who was shot as a kid, by his stepfather, about eight times with a .25 auto. He'd walk around shirtless in summertime- he had bullet wound scars all over the place.