I would never leave a treestand in favor of ground during archery season, especially with 20 mins of light left, that i would say is a mistake. Also, hunting a lot is a lot different than hunting smart. That guy could have been waiting for the perfect wind and purposely let that stand sit unpressured to have exactly what happened, happen. I once sat for the first time on a 20 acre property and shot a 135" nine point that the neighbors had been hounding for weeks. I knew the area and where the bucks went to when pressured, so even though I wasn't there, I was still hunting him indirectly. I've read on here several times where you have seen that buck and he never seems to be where you are. Sounds to me like the buck has patterned you, more so than you patterned him. The best way to pattern a deer is to not be there. Either watching him by cams or from a long distance, then move in. Otherwise he most likely knows your entries and exits, and he is toying with ya.