Its easy! That boss lvl 90. When you use some stunning skill it creates shadows that after a few seconds they disappear and drop the hunt. You need to test a few times because it is not always the first time the hunt drop. I already got to get the hunt after trying 5 times.
Oh really? That's such a simple thing! Thanks a lot for the explanation, now i can have some fun playing with the Archer and see how it goes.