I experienced a similar situation when i was in college, the only difference was, it was a very good friend of mine who pulled the same stunt. i had gotten permission to hunt a very nice chunk of ground from the owners by knocking on doors. Well, i took him out there because he didn't have a place to hunt but had a muzzle loader tag (he didn't have a place to hunt at school because he didn't have the balls to go asking, just kind of leached off of anyone he could). Well the following fall rolled around, and he called me and said that he had went out to the farm and put up a stand...I was fired up, bigtime! Needless to say, he went behind my back and asked permission to hunt the same property, which, i guess, is my fault because i took him out there in the first place. SO i called him up and layed into him about it because there was already my girlfriend and i plus one more bow hunter out there, and the landowners gun hunt it (its less than 100 acres mind you), and it already has enough pressure. Eventually, i got over it because there was nothing i could do about it, and i didn't think it was worth our friendship; however there was definitely a lesson to be learned there. In the future, don't take someone of that character to your favorite spot, or, lay down some serious ground rules. Good Huntin'