"I think that the actual choice was his own, but that the spell of Glaurung clouded his mind and thus caused him to choose poorly."
Turin has a long history of poor choices even when *not* beclouded by a dragon. It all comes back to what I said before, he lets himself be blown around by gusts of passion instead of trying to think things out and make a *rational* decision. And Morgoth uses this weakness against him.
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