This passage is a continuation of that of the question www.EnglishForward.com/English/NotYouAsWell/bjnjxr/post.htm .
“That’s not the point,” said Hermione. “She thinks it was her fault he died!” “How does she work that one out?” asked Harry, in spite of himself. “Well, she was fighting Bellatrix Lestrange, wasn’t she? I think she feels that if only she had finished her off, Bellatrix couldn’t have killed Sirius.”
? What does 'work that one out' mean?
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