I had a rough 3 year patch early in my archery career where I can think of four poorly placed shots that resulted in 3 unrecovered deer. One deer I seen a couple month later and the others I have to guess eventually died and the coyotes got them. Each time I tried my best, backed up for a long period of time, and looked for hours on end to try and recover those deer. The fact of the matter is it happens, it happened to me already, and will probably happen again before my career in bowhunting is finished. I just try to concentrate a little harder and do not take any marginal shots that I know I couldn't make 9/10 times.