Billy Busch is accused of trying to break up a fight between his son and a fellow sixth grader during a basketball practice at school.
Police say the 58-year-old grabbed the 11-year-old boy and pushed him up against a wall.
Other adults then had to separate them.
In newly released audio from Busch's phone call with a detective, he tells his side.
The boy's parents called Busch's actions "unconscionable."
He is now charged with misdemeanor fourth-degree assault.
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