Honestly, I'm see them greeting each other in a cool and cordial manner like the much-parodied Wrex-Shepherd greetings, followed by some witty, dry dialogue about their respective students, Rianna and Ayanami.

And that would be about that. Oh, and maybe some off-screen meeting that's only hinted at... and, hey! Who's this young up-and-coming Sith Lord? (No, not that they're really 'together', but I'd imagine it'd be something similar to Skuld and Gryphon's relationship.)

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