Characters
I heard your lieutenant is a real ball buster.
— Ace Levy
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker reports hearsay that someone's lieutenant is exceptionally tough and unforgiving. 'Ball buster' is blunt slang for a demanding, hard-driving person, and the phrasing passes the reputation along secondhand, like a heads-up with no detail.
Context reviewed