Why not let the man come hunt with you and the dog & he can see for himself what the dog does. Just a thought.
x2 if you're that worried about it...
Another question is, why are you trying to sell a dog that you don't know how it hunts? Figured if you had any time, money, ect in the dog and you're trying to sell it then you'd already know the how the dog works... Although she may be a goodun or maybe a cull, if you don't already know how she hunts, what's the premise for selling her?
And personally, we love to run one or two decent older dogs with one pup on the ground. After about 2-4 times in the woods you're going to know what you're hunting, and it should show you something... If it doesn't then it brings us back to the question, why are you trying to sell the dog???