For owners of the Nature's Ire co-op, what do you think - is it a fair tactic to kill all of the goblins, thereby stopping movement of the sacks towards the falls in each enemy phase? The flavour text indicates that the goblins are hauling the sacks into the falls...so no goblin haulers, no movement of sacks into the falls?
It might help the situation, for heroes who have poor attribute scores and struggle with successfully opening sacks.