Why did Casey and Herrmann wage war on one another?
On Chicago Fire Season 7 Episode 17, the pair argued when the firehouse responded to an apartment fire.
Kidd and Severide realized there was something amiss with the fire, and turned to the CPD for some clarity.
Meanwhile, Brett struggled to deal with her emotions, leading to an epic confrontation with one of her colleagues.
Elsewhere, Herrmann's wife, Cindy, realized that she was not getting any younger.
As such, she decided to take a stab at redoing the common room.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.