Gang members take firehouse 51 hostage but forces them to treat a gunshot wound from one of the members but this doesn't turn out in the best way.

Season 5 Episode 15 "Telling Her Goodbye"
Firehouse 51 is put into a hostage situation when a group of gang members run into 51 to take refuge when dealing with a escalating gang retaliation. One of their members is seriously injured and Stella is forced to tend him because Dawson and Brett are on a call. Severide does everything he can to stay hidden and figure out a plan.

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