My first bowkill, a doe was a spine shot, she ducked/rocked back and the broadhead clipped the very tip of her shoulder blade and deflected into the spine and shattered it. It did sound just like what farm hunter said
The impact of a spine shot can sound like a 2x4 batted against a light pole
it was LOUD! She went down like I had shot her with a 30-30, there was no flipping around, but I had to put a second one through the heart to finish her quickly.