Well, I may not be an old vet... but I did just recently finish up SR: Chronicles so will add my Ĩ2 from that perspective.
When you start looking at confronting the AI directly there's two things that sprang to y mind here. One, it was trying to break free, to ensure it could never be "imprisoned again", also when you confront someone it has taken over completely it accuses you of betraying it.
Combine this with the fact that the nanites where augmented with enhanced obsidian, allowing them to connect to the Resonance... a join project between a professor of Thaumaturgy at MIT&T, specializing in Alchemy, and a technomancer student attempting to create technomancer foci.
To me, from what I read about the history and personalities of the big three AIs here... it seems that whatever else came through is, or at least was, Dues. it hitched a ride on nanites that could connect to Resonance, it's primary goal is to gain freedom and ensure it can never be imprisoned again, and it accuses of betrayal when directly confronted.