I love getting creatures to fight each other in D&D and watch the outcome. So I spent quite a bit of time setting up fights. I have gotten the spectator to fight pretty much everything. And in the newest fights I had in patch 9, Spectator vs Hag. The spectator's AI seems to have gotten much better. However, he wastes his second beam on a dying copy of the hag. He will use Wounding Ray on a hag illusion, and then a second ray on the same illusion as it's dying animation is still going. Wasting the second ray. I know this is not a "normal" thing to do. However, I feel that it is note worthy and wanted to point that out.
Also, the spectator AND the ogres will kill Mayrina. The spectator makes sense. But the ogres fighting for you, targeting Mayrina doesn't seem like something that should happen.