Explanation:

The unimaginable God cannot be mentioned directly. Since the unimaginable God has charged the jivaatman or bird, God has to be mentioned as a jivaatman or bird alone. Whenever God enters a medium, God has to be mentioned by the name of that medium alone. The live wire stands for the [unseen] electric current. Hence here, God is mentioned as a jivaatman or bird. But there is one doubt in mentioning God as the second bird. When God charges the bird, the bird itself stands as God and there is no need of a second bird. Yet here a second bird is mentioned. This means that God is not the bird actually and is quite different from the bird or jivaatman. Hence, the second bird means that God is not actually the bird but is mentioned as a bird only since God has charged the bird. The word ‘second’ denotes the separate existence of the original God.