A large scale fight with crumbling golems ensues and you managed to break enough of them to create a lull in the fighting and escaped while the golems tried to pull themselves together. You don’t know when they stopped chasing you since you never looked back.
With the arm recovered you set about trying to find the head. By calling in favors and nearly getting into a magic match with a powerful warlock you eventually tracked the thief back to a slightly collapsed chapel or museum. Karos tried another of his infamous disguise tactics but the thief was so paranoid he retreated further into the building without even seeing who was knocking.
Thus you ended up in the entrance of a the building with a warforged swordmage and two serrated discs discs.