I think another crucial question is in what context was the spot fished. I think if you don’t want someone to fish your spots than you need to define which ones where yours. I was out with fluker this weekend and took him to some areas were i was catching some bass. Together we explored up the bank and found some good fish. So who’s spot is that? I led him to the area but he fished it differenty and found bigger fish. I think in a case like pre fishing you should just communicate to your fishing partner and set some ground rules.