Well when they are scent checking they are putting their nose as high in the air as possible as if they were trying to reach for an apple above their head. When they spot your scan the trees they look directly at you and wonder what that blob is. I've figured GMMAT you've spent enough time in the woods you could tell the difference.
You're entitled to believe anything you want. From 40 yds....even if you're 25' up....you'r estill in their sight line. I've had PLENTY of deer "look up" and see my outline. Do I think they're going through the woods doing this a lot? Nope.
I just don't give them these analytical powers a lot of you do. I don't think they're capable of such. Seems like they'd learn that the two movinglights 6' apart on a horizontal plane near that black, hard trail means a quick death. But....they sure seem to forget it as fast as they learnit ....if that's true.