Agreed, If he is violating the law then turn him in with as much info as posssible. The 4 wheeler and the lock on are a good start. They might not have bite but they start the eye watching(Maybe). It seems petty, but right is right and wrong is wrong. I would deffinately think about moving my stand site tho, retaliation while in a tree is not a fun thing. This is the mentality of so many public land hunters. Good luck on this season.