That's a common mishap, one tends to look for game at the horizon, forgetting some may be bedded up close. When I approach my stand (always against the wind)and there's high grass near it, I'll stop and hide to spy the surroundings before breaking a small twig. Not enough noise to spook game but still enough to see a head coming up to investigate. If that's the case, I wait for the head to disappear, wait some more in case the Roe checks again (they often play that trick) and withdraw quietly. For if you get barked at, you may call it off in that part of the woods.