So Close... 6th Sense?

[Tom Leemans]

It's like you walking into your living room and noticing a stranger sitting in your recliner. He might be sleeping, but you know something's wrong with the picture.

[maineac]

I know eye contact is a definite no-no.  If they have not noticed you before then,they will immediately know you are not a part of the tree or brush.  I think we move way more than we think.  A slight adjustment of the bow, a movement of the feet or body to get ready for the shot.  On one of them the deer notices something, and just moves off.