I know this isn't what you want to hear, but you can't really do anything about it, since it's not on the property you have permission to. And unless you went off of your property, and sat in his stand, you have no idea where his shots are. Stuff looks way different on the ground than they do 15' up.
I know it's kind of a d*** move on his part, but from your story it sounded to me like you were going to hang a stand right off his property also.
JMO