Characters
He's the only man I know who can strut sitting down.
— E. K. Hornbeck · Inherit the Wind

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
This is a barbed compliment about someone's swagger. Even while seated, the man in question manages to project strutting self-importance. The remark mocks vanity by imagining a walk without walking, and its wit lies in how effortless and unavoidable the showiness appears.
Context reviewed