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. br br Season 5 Episode15 "Telling Her Goodbye"br 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.