Your in GA like me and I can tell you straight from the wardens mouth in my county that they have to have written permission to step foot on your property and cannot shoot nor come onto your land without said permission to retrieve his deer. That being said you cannot do anyhting since hes not on your land but he cannot shoot anything on your side. The warden even told me you DO NOT have to have your borders posted, just have a land lot map with you if a warden is to be called when someone is on your property. The wardens can even use all there powers in that situation to. If the guy didnt see you I would consider a little covert op and sit back there to try and catch him if he does shoot on your land. To me it sounds like hes the guy that got turned down and is ticked off so hes gettin as close as he can.