All hope is lost during a fire and Casey says goodbye to Dawson before Boden decides to use the water canons with his men still inside a burning building.

Season 6 Episode 1 "It Wasn't Enough"
With most of Firehouse 51 still trapped in the warehouse fire, Boden makes a split decision and uses water cannons in order to save his men despite the dangers caused by the resulting steam. Two months later, Casey, along with Mouch and the rest of the Firehouse survives. Casey receives a Medal of Valor and it is revealed he is being considered for promotion to Captain; Casey's view on the matter is that he has had enough politics. Meanwhile, Dawson's father moves out without notice and finds employment once more. Meanwhile, Mouch returns to 51 with a new fitness persona. Also, Brett reunites with a childhood friend by the name of Hope, who strikes up a relationship with Severide. A teacher gets burned in a fire at the high school where Boden's wife, Donna, recently started working at. Donna later reveals that the fire was not an accident.

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