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I would say it is definitely a new paragraph if only to indicate 'he' didn't say 'I thought ...'. I teach that you start a new paragraph when you change speaker, place, time or character. Here the...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41263 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/