This challenge requires killing by fire, shooting red barrels or shoting fire arrows and let them die by fire ..
problem is .. there are no red barrels and fire enchant doesnt work ..
It does the normal fire animation and has AOE fire damage, but i dont shot fire arrows ..
I checked videos on youtube, there are supposed to be fire barrels .. as you can see, they are not there right from the challenge start ..some of them are, but watching the youtube video, they are supposed to be everywhere which makes the challenge childs play but with this .. missing barrels and not working fire arrow, its impossible