…and from Abba and Imma together to Zeir Anpin… This is clearly the proper order – for Zeir Anpin is Daat, the intermediary reconciliatory factor between Chochmah and Binah: Daat receives the lights of both together.
…and from Zeir Anpin to the Nukva. In this case the receiver is not on the same level as the giver of influence but below – the Nukva stands from the navel of Zeir Anpin and below – because the deeds of the lower creations are liable to impair the receiver.
Part 2: The influence takes on a different form according to the way it spreads. The purpose of all these many levels is to bring the influence to a level suitable for its receivers. The lower any given level, the nearer it is to the lowest creations. When the influence reaches a lower level, it is affected by that lower level and assumes its nature. This is how the influence comes ever closer to the creatures of the lowest world, until it reaches the last level, where it is right by them.