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Here, it's most likely the old, familiar bug with heroes who are essentially convicts. Someone mentioned earlier in the thread that the checkbox next to the "Free Talanar and Dirael" quest doesn't always appear.
It's a bug.
What helped me was this: hire any new hero in the castle. Apparently, after that, the game "checks" the heroes and... joy!... it discovers the freed slackers. Voila - the checkbox appears, and the quest is completed.
Just an option.:rolleyes: