which balls?
Githongo was lured by NARC due to his good reputation of being an anti corruption crusader and ensnared to work for the government.
He was NARC's poster boy of how determined NARC was in the fight aganist corruption, then he realized he had been duped and felt like a donkey's ass.
He couldn't live with himself.
His Ego kicks in (After all i am an intelligent man he tells himself how do i tell my colleagues i have been duped.)
He thus starts behaving like a spurned lover who discovers her lovers promises were just that- promises and decides to embarrass him just like he did to her.