Exclusive Chicago P.D. Sneak Peek: Why Is Ruzek Beating the Crap Out of Atwater?!

You gotta give it to the Intelligence Unit on Chicago P.D. When they go undercover, they really commit.

On Wednesday's new episode (10/9c, NBC), Ruzek (Patrick John Flueger) and Atwater (LaRoyce Hawkins) pose as inmates in a prison in order to investigate a suspect in the murder of a 10-year-old girl from the inside.

TV's sexiest male crime fighters

However, when Antonio (Jon Seda) tells Ruzek that their investigation has hit a big snag in this exclusive sneak peek, Ruzek takes matters into his own hands and throws a mean left hook at Atwater. (It makes even more heartbreaking knowing that they're such good friends in real life!)

Check out their brutal fight, and what happens next, in the exclusive video below:

Chicago P.D. airs Wednesdays at 10/9c on NBC. Who do you think looks better in orange?