Hate to shoot a hole in this noise discussion, but I used to think this way too. My bow was way to fast to worry about deer jumping until this season. I have used a X-bow for almost 20 yrs now. Shot prob 50 deer with one.Thot was best weapon ever. Shot most deer 18 yrds or less. I have noticed some hits were a little off from where I was aiming. Definately some deer have moved a bit before hit, but never missed the body vitals,,till this yr. I had never shot a deer from this stand. It was same height as my other stands, 14 ft. But landscape drops sharply away from base of ladder, making me higher with a more extreme downward shooting angle. Was a perfect morning,,frosty,,quiet,,heard deer stepping behind me. Thot it sounded like a buck. Gave a call,,sounded like he was walking away,,then he was coming back,and right to my shot opening,,was a decnt buck and I was ready,,steady,,sights on chest,,fired. Heard hit,,but when I got down,,saw what you don't want to see,,white hair. Only blood was on vanes and was greay type. I went home waited 3 1/2 hrs. Went to track and jumped him. He took off across fields and over fences until I came to conclusion this deer was not going to die from this wound. I put target where he was and shot. Right on hit but noticed high angle. I am sure he jumped a bit before hit and with angle easy to shoot thru botom of deer. Week later another buck walked out same stand,this time 24 yrds away,not quite as sharp angle but more than used to. I moved a bit too fast, buck saw movement,,stopped,,looked. I made NO1# mistake,,never shoot at alert deer. I did,was right on vitals,,heard hit,,,got down,,as got down heard deer snort a ways off. That is not good for a deer to snort,,means not hit bad. Again white hairs on ground,,arrow bloodless. Another miss!! This buck had to be way ahead of my arrow,Just clipped belly hair. Moral of story: I lowered stand 4 feet,,much better angle,,and now I know deer can jump out of way of my crossbow. I have a 10pt Pro Fision. Fast bows shoot 300ft per sec,,,Deer can react 600ft per sec. From what I have read from other sites,,this can and will eventually happen to all. Was hard pill to swallow for me.