I have never had this happen as well. However, last year while up in stand I heard something from behind. As I truned to look, it was a big ole doe that was tracking me in the ditch I walked in on. She knew something was up. As she cautiously walked by I let out a light "Baaaab" to stop her. When I did, she instantly jumped up about 3 feet in the air and about 10 feet forward in one bound. There is no doubt that this ole gal would have jumped the string. As TFOX said, is best to shoot when they are completely relaxed.