FIELD SONG: THE SECOND KNOCK Verse: The first knock came with fever. The first road opened slow. The watchers had to learn the face of what they did not know. Chorus: Memory is not clinging. Memory is a Gate. The second time the signal comes, the answer won't be late. Verse: A little harmless training showed the body what to see. Not every warning is the war. Some warnings keep us free. Chorus: Memory is not clinging. Memory is a Gate. The second time the signal comes, the answer won't be late. Ending: The immune field remembers, but must remember clean. Attack the threat before it spreads. Do not attack the being.