求翻译：I gently but firmly explained to him that I didn't make the rules around here, but was obliged to keep them. As much as I would have liked to make an exception of this rule for him, Dr. Bechtel, the head of St. Mungo's, would never allow it. Mr. Potter was stoic in the face of this news, but I could tell he was devasta是什么意思？

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