Well, as facts are still being sorted out, (and I don't know what the laws are there for carrying a weapon), what person is going to go through legal steps to carry a gun and then obtain a gun with SN filed off? A SN filed off often tells me it's liked to a crime...
Indiana is fairly reasonable with their CCW permits, and I've seen "shady" cases go in favor of the lawful gun owner who shoots the perp. This case sounds a bit strange...He took the gun away, then fired 15 times?