I've never had one duck the arrow, but I've seen plenty on video. I do kind of doubt that at 10 yds one could move completely out of the way. I've read lots where guys said sound travels this fast, arrows fly that fast, ect, but I just don't believe that under 15yds or so one could completely duck an arrow shot at the middle of his chest. I see lots of videos where the deer ducks it barely at 15-20yds, though.