hunter set up on me once.
I was hunting in a stand on the border of a field that had been hunted by our party for over 15 years. I climb up look behind me and see a bow hunter 30 years behind me. (this is the same guy we had to take down his stands and leave notes on them when they were 300 yards up on our property. I got the tax maps and showed him the old fence lines and survey stakes, after a while he agreed we knew the boundaries. ) that's another story.
continuing on... I walked over to him and whispered hey, whats up as to not ruin our hunt. He came down and I said, "I know this is your property but we've been hunting out of that stand on ours for years and your 30 yards away. Did you have to set up right on top of me?" He got a little grumpy and said ok I'll move it and started to put his bow away. I said, Whoa whoa... it's about 4:00.. magic hour so keep it there and lets hunt here and now the deer will be comming anytime... if you move it down there.. that would be appreciated but don't do it now and ruin both our hunts." We bothed hunted next to each other, a week later he moved it to where I suggested, which I knew to be a better spot.
We have since spoken again several times and no problems. He has a narrow 2-3 acre swath of land below where we hunt between us and the lake and cottages, its too small to hunt really but there are a lot of deer that go through that area. He later moved it again down 400 yards or so close to one of our other stands but we don't hunt it when he's there as we could be shooting at the same deer. We wouldn't like him to hunt there at all as it makes us move but it's his land and he has no other place to go on his land.. All in all we worked it out. We aren't friends but we have been cordial and it's working. Moral to the story... stay calm, talk it out, there are lots of deer none are worth the trouble to get mad about.