Obviously, whatever .380 round was being used didn't have much of a temporary wound cavity. However, I'm surprised the bullet made it all the way through.
If you have doubts as to the results of the .380 bullet's ballistic results, get a couple boxes and put it to the test. I'm pretty sure that a round nose, full metal jacket will go through the human body if it isn't deflected by a bone into another bone. Jacketed hollow points are designed to expand, do more damage, and not to pass through completely. But, that doesn't mean they won't.
I shot a buck back in 01' with a 12 ga. semi autoloader. I hit him on the left side behind the shoulder blade, and the slug was stuck in the right one. That's a 3"magnum, 1oz. slug at about 50 yards. Given the choice of firearms to defend myself. I would choose the slug gun even though the slug didn't go all the way through.