“Burn” is a new documentary about fires and the men who fight them. I expected it to be a tough look at some tough guys.

And it is. But “Burn” shows another side of the life, too. The film begins with a swagger, as Iggy Pop & the Stooges’ stylish song “Gimme Danger” plays. In fact, one man uses the word “swagger” to describe how Detroit firefighters walk their city.

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