"Sometimes an ever-liberated personal associate of the Supreme Personality of Godhead descends into this universe just as the Lord descends. Although working for the liberation of conditioned souls, the messenger of the Supreme Lord remains untouched by the material energy. Generally ever-liberated personalities live in the spiritual world as associates of Lord Kṛṣṇa, and they are known as kṛṣṇa-pāriṣada, associates of the Lord. Their only business is enjoying Lord Kṛṣṇa's company, and even though such eternally liberated persons come within this material world to serve the Lord's purpose, they enjoy Lord Kṛṣṇa's company without stoppage. The ever-liberated person who works on Kṛṣṇa's behalf enjoys Lord Kṛṣṇa's company through his engagement."
Sri Caitanya-caritamrta - 1975 -Madhya 22.14-15
From authoritative sources it can be discerned that associates of Lord Viṣṇu who descend from Vaikuṇṭha do not actually fall. They come with the purpose of fulfilling the desire of the Lord, and their descent to this material world is comparable to that of the Lord. The Lord comes to this material world through the agency of His internal potency, and similarly, when a devotee or associate of the Lord descends to this material world, he does so through the action of the spiritual energy."