Bullets do strange things at times. I once chased a nice mulie down into Devil's Gulch that my brother had shot broadside through both lungs with a 100g NPT from his 6mm Rem. Didn't think that SOB would ever die. I took the only shots I had while traversing the steep terrain. My first shot with a 140NAB at 3200MV was a feeble attempt at a THS through a small hole in the brush, which exploded on his rear ham and failed to even make it to the intestines. After some climbing around the steep canyon, I finally had a small hole through the brush to his neck and ended his misery. It took us 8 hours to pack him out and he'd not even made it near the bottom of the gulch. Had I not put finishers in the buck, It would have been a much longer day.

Point being, do it long enough and weird stuff happens. I could tell many other weird bullet performance stories....