I've had many deer just seem like they appear out of nowhere. I scanned the area REALLY good, then I had to stand up to stetch, and then all of a sudden, I hear deer blowing and stomping. Look to my left and a group of does are right there. Then they decide to keep coming in, and walk just out of range lol. Seems like they knew how far to walk out in front of me without me being able to get a shot. At least that hasn't happened this year yet anyway.