Cruz Hunts for an old friend he took under his wing who previously assaulted Hermann with a knife.

Season 4 Episode 10 "The Beating Heart"
Hermann is rushed to Chicago Med after being stabbed at Molly's. After losing a lot a blood, it is determined he needs emergency surgery. Feeling guilty about Hermann's present state, Cruz searches for Freddy to turn him in. Severide is reinstated as Lieutenant while Borelli grows more concerned about Chili's erratic behavior. Mouch considers finally proposing to Platt.

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