on leave for anti-Bush remarks

Teacher put on leave for anti-Bush remarks
“Sophomore Sean Allen recorded about 20 minutes of Bennish’s class during a February 1 discussion about Bush’s State of the Union speech and gave the recording to his father, who complained to the principal, Amole said."
From CNN.

What I want to know is: why was a student recording a lesson, and why did he feel the need to play it back to his father?

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