Andras is afraid that Saruman is forging weapons of great power in his personal Foundry beneath Isengard... though he knows not what form those weapons are taking.
Andras asked you to enter Saruman's Foundry and defeat his acolyte, Penrith, a Dunlending who has forsaken the ways of the clans and has embraced the world of the foul magic called 'industry' which Saruman espouses.