just be polite, respect what he has to say, if yes say thank you, And of you go....
plus it doesn't hurt to ask if he would eat the odd bit of whatever you kill for the pot,
If he says No say thank for your time anyway... And walk off, i had a farmer say NO once to see my reaction, and as i was getting into the jeep he said oi...
because i was calm and said thanks anyway, he took a change of heart,
most of my permissions now Ask for me to take care of things, Word of mouth travels for the good as well as the bad news...
Good luck.
Snap.