When Hans became a troll-hunter is unknown, but at some point in his life he was recruited by the TSS(Troll-security-service) and given the task of killing the trolls in Norway who ventures to close to human settlements. He was also required to keep the existence of the creatures confidential, presumably to avoid mass-panic. They are once again allowed to witness Hans's level of skill as he collects a blood-sample from a bridge-troll (or "Raglefant"). Hans then introduces them to a veterinary who also works for the TSS and is charged with studying the trolls.