I could have told him it would do that. In fact, I did.
This is why I carry Federal 95gr LSWC in my S&W 432PD. There's nothing magic about expansion. As far as I'm concerned, its most important function in CCW pistol ammo is moderating excessive penetration in service calibers. I've seen unexpanded Winchester Ranger-T 127gr +P+ penetrate clean through two sixteen inch blocks of clear gel.