[Desuma Malevois]

I could be wrong, but I seem to recall that there is actually a time limit involved when Anomen leaves your party. Had you actually gone right after him,.........
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what should have happened was that you would have found him at Saerk's confronting the murderer of Moira. You would then have some dialogue options which include one that convinces Anomen to spare Saerk and let the law take its course. Afterwards, everything is hunky-dory.