Gandalf knew that Sauron did not have the Ring. He probably figured out that they had only captured one hobbit, but the Mouth had items from both hobbits. So perhaps he wasn't sure for a bit. Also, even if he knew one of the hobbits was free, he must have felt anguish for the one that was captured. And perhaps another part of the "wizening" was that he was afraid the Quest would be betrayed or revealed.
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A Gandalf-uncloaking-free zone.
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