翻译的问题？

画红线处，按常理，叙马库斯不太可能去印度避暑。原文为：Sometime after 395, our old friend Symmachus – enjoying an Indian summer, to judge from his correspondence.

维基上Indian Summer词条解释为

Indian summer is a period of unseasonably warm, dry weather that sometimes occurs in spring and autumn in the Northern Hemisphere.

所以叙马库斯既不在印度，也不是在避暑...

不知道对不对