'Chicago Fire’ Season 13 Finale Promo Hints at Pascal and Severide's Departure from Firehouse 51

Chicago Fire Season 12, Episode 21, "The Bad Guy," had Severide (Taylor Kinney) and Pascal (Dermot Mulroney) team up in an unlikely turn of events. Pascal wanted to prove his innocence in the attempted murder of Robert Franklin, the driver involved in the accident that resulted in his wife's death. Severide wanted to believe Pascal was innocent and was looking to prove that he'd been framed. However, it seemed clear with every passing scene that Pascal was guilty. He's done it before and had the means, motive, and opportunity to do it again. The logline for Episode 22, "It Had to End This Way," reads: Severide puts his job on the line to help out one of their own; Kidd (Miranda Rae Mayo) navigates Natalie's complicated relationship with her sister; Herrmann (David Eigenberg) prepares to take the Chief test. NBC released a sneak peek of the season finale airing next week on May 21.