Is this not just WEIRD? Still don't know the story, but the circumstantial evidence is a bit damning at face value. But CBS Sportsline had an article about Harrison's Belgian gun and it apparently could pierce like 45+ layers of Kevlar (bulletproof vests).
That's one savage gun, dude. 
I should see if I can get David Slam to weigh in on this one, he's a firearms enthusiast and aficionado.