I found about 4 of those areas this weekend. I call them bull bedrooms. My inexperienced hunter theory is that that's where the bulls go to be solitary before they start searching for cows. That's where they rub their velvet off and get all worked up. I don't want to steer you wrong but based on sign, i don't think they go back to them inside the rut unless the herd is just passing through. I could be wrong though and it could be that you'll find a bull w/o a herd in some of those spots. It's worth a shot sitting tight and calling for a half hr imo. We tried w/o success in all 4 spots.