what would happen if a pre-veil entity and a post-veil entity interacted?

[Jade]

how, actually, does the pre-veiled entity build polarity at all?? what is their catalyst, if not from the potential for service-to-self?

They build it the same way a veiled entity does, by service to others (I would say service to self as well, but an unveiled being would have extreme difficulty becoming STS). But it is harder for them to build up enough of the requisite love because there is no essential existential angst or dissatisfaction driving them towards 'something better'. They are divinely happy, and thus are content to progress at a snails pace. This is why the veil was implemented.

Just as an aside and to further the discussion, before the veil, there was no STS. According to Ra, creation of the veil = creation of STS = creation of free will. The veil gives us the free will to choose to not recognize the unity in all of creation. Before the veil, we weren't afforded that exquisite "opportunity". If you recognize the unity of Creation, there is no way to serve the self without serving the all from the get go. The veil sets up for us the illusion of a choice between the two.