I agree. If they were there first or if they are relatives etc. then consider yourself lucky to even be able to hunt there at all. If you were there first I would explain to the landowner about the size of the area not being able to hold alot of hunters (especially if they gun hunt also)etc., etc. and see if you can lease it exclusively. I wouldn't worry about stepping on toes in this case because it looks like your secret honey hole isn't a secret anymore and even worse, if they are going to be stomping all over the place and leaving dead deer around ( I think I readthat you found a bloody arrow and a dead deer?)then the gig is pretty much up anyhow.I think you have nothing to lose by going to the landowner and the quicker the better( get it right for next year).Sorry to hear about this...those small, thick, tucked away spots can be pretty powerful sometimes.Good Luck.