Just pesky bug. I have several times come to get the task done, but the result is the same every time (luckily I read here).
Also, I try to positions in the green line, so now annoying.
The game punishes the free examination of the Example if you destroy the nest without that you've been talking about it first, the hunter, if it is required so failed the character should be. In my opinion, such a measure demanding task should lock in some way, that it can not do without talking, or initiating the formal assignment. Many times I have had to re-download the game to a certain point in order to get a successful mission done. Two other task I failed because I visited those places in advance researching.