The Doctor learns that Tebbis has died despite the fact that continued injections would have saved him. He figures out a means to escape Level Blue to continue to try to save the other patients in the lower levels.
Mistaking him for the late Tebbis, The Allocator mistakenly assigns Chellick a low TC, preventing him from getting the proper treatment. With this leverage, the Doctor convinces Chellick to move the low-TC patients, including himself, to level Blue to receive care.