More of a suggestion than a bug report. The popup text says to attack, blow the horn, kill, then loot the weapons. I did this on my mage and died in seconds because the mobs overwhelm you and the reinforcements don't seem to pull them off you.

All you need to do is go to the camp, blow the horn (without attacking) and the reinforcements that arrive will take on all the mobs for you - you can just walk in and loot the weapons.