Yep a spine shot will drop a deer in its tracks but will take a second shot to finish the job. My buck I killed this year I stalked it while it was in its bed down in a dried creek bed about 10 feet below me. I stalked right in behind and above him and put my arrow right behind the shoulder blades and cut the heart in 3 pieces and he jumped took two steps and dropped like a rock, no kicking no nothing just dead. I think he was dead before he ever stood up!! Walt