football coach who says he saw sandusky abusing a young boy on penn state campus when he was a grad assistant. abc's jim avila reports from pennsylvania. >> reporter: two big men on campus, the defensive coach who built linebacker u, jerry sandusky, now an accused child molester, versus the protege, a young, thick-necked red-headed offensive coach named mike mcqueary, staring each down from across a courtroom. high drama as mcqueary in a loud, strong voice, recalled another time he was in the same room with sandusky, a locker room. watching, he testified, a raw sexual assault on a little boy. this was the moment that would eventually lead to the firing of coaching legend joe paterno and tarnish the reputation of this country's most respected football program forever. >> here was the man who literally brought penn state to its knees. >> reporter: mcqueary practically barked his testimony telling his story of the assault he saw and heard in the penn