How does anyone possibly know if a deer that they have shot at and missed was due to the deer "jumping the string?" That is impossible unless you are video taping your shot or doing something much worse and that would be concentrating on your arrow instead of your target. I've shot dozens of whitetails and as far as I can tell, none have "jumped the string". I've seen the videos and I've seen Hunting October Whitetails and do believe that deer do duck or "jump the string" but I don't see how one can be certain that the deer they missed "jumped the string".