NP. How did you end up capturing him? What tactic finally worked?
Capturing him was never the problem. A simple trick of forbidding the food/booze to make him walk, and a cage trap at the door. Initially he would go insane in the cage, or die of thirst (because he was already dehydrated in the earliest save) so I'd given up on trapping as a viable method. Once I got him watered via the well, and happy via assigned rooms and offices, caging was possible.
As part of his new facility I have an airlock in which (by locking and unlocking doors) I can easily place him on the cage trap, which is much more efficient. He has a private well, and keeps working even when hungry since he can't path to the food, so I only need to trap him when he is starving. Unfortunately for every period he spends pumping, he spends twice that time unconscious, so it will be a very long time until he is tough enough to eat on his own.
This made me laugh:
Meng Olinoddom has been ecstatic lately. He is happy to be free. He has complained of thirst lately. He received food recently. He admired a splendid Trap lately. He admired his own fine Door lately. He slept in a great bedroom recently. He received water recently. He was unable to find somebody in charge to yell at lately. He has been starving lately. He has complained of hunger lately.