I would make it clear to your friend that he should have asked you first. Make it clear thathis new buddy is not welcome on OPENING DAY, but maybe later. Pick another day when you can assess the new guy's ability etc.

IMHO, I wouldn'twantto scare the new guy off from hunting, but use this as an example about asking permission etc. Make it clear to the new guy that the permission you have is for you and your friend.

I got burned very badlysome years ago in a similar situation involving a dove field. It took a while for the land owner to let me back on the place,but I never again got access to the good areas or times.