Severide should really be in a better mood. After all, Chicago P.D. just took down the arsonist responsible for the deaths of Mills' dad and Severide's BFF Shay.

But that's definitely not the case on Tuesday's new episode of Chicago Fire (10/9c, NBC). In this exclusive sneak peek, Severide (Taylor Kinney) gets a surprise call from the captain of arson investigations. "Are you fishing for details or are you just raw that someone did the job you weren't willing to do?" he asks tersely.

Celebs visit at TCA!

Don't worry. The captain isn't afraid to dish it right back. Check out this exclusive video to see their heated - pun intended - conversation and to find out what arson wants with Severide:

Chicago Fire airs Tuesdays at 10/9c on NBC.