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It is fine to extend a sentence after a tag, and the first form is correct: "he said" should also be followed by a comma. "I don't like this at all," he said, as the door closed behind them.
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/46583 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46583 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/