During the last days of World War II, Tornow was one of the few remaining German personnel in the "Führerbunker". During the course of 29 April 1945, Hitler learned of the death of his ally, Benito Mussolini, who had been publicly executed by Italian partisans. This, along with the fact the Soviet Red Army was closing in on his location, led Hitler to strengthen his resolve not to be captured alive. That afternoon, Hitler expressed doubts about the cyanide capsules he had received through Heinrich Himmler's SS. To verify the capsules' potency, Hitler ordered Werner Haase to test them on his dog, Blondi. Tornow had to force the opening of the dog's mouth while Haase crushed a cyanide capsule in Blondi's mouth. Tornow became visibly upset by these events, more so when the dog died as a result.