Vaskorn has gone off to deal with the Ungoledain single-handedly and without protection from the poison. Threkmóth concedes this may have been a mistake.
'You think it was reckless to send Vaskorn by himself? Well... perhaps so. My mind was very much on my baking, you see, and it seemed sensible enough at the time.
'Every once in a while, one Beorning is not enough for the task. I do not think we are too late. We should help him. He thinks very highly of you, ${RACE}, so I will trust you. You have seen what we are up against, after all. You may lead us to their camp.
'Here is my plan: you return to the brown wizard and bring back this potion of his, while I will get the others prepared for the outing.'
You should return to Radagast, in the Thornholt woods, to collect the potion which will guard against the Ungoladan-poison.
You should return once again to the Beorning camp of Skoghús, in the south of Thornholt, and let Threkmóth know you have Radagast's potion.
You should deliver the poison protection to Fiskvat and Hunulf, Threkmóth's neighbours.
You should return to Threkmóth, now that you have given Radagast's potion to Fiskvat and Hunulf.