Guy in the photo's taught me quite abit about spot/stalking. One of the most usefull things he taught me. Was how to triangulate a bedded canine's coordinance within mere ft. Useing terrain features/land markers. Et if done properly & useing enough time to figure land marker coordinance(s) from the canine.
A hunter can sneak in from any direction (blindy), if they so choose. Et top their last hilltop/ridgeline & see the canine dead ahead. That is unaware of your presense.