Chicago Fire 14x04 "Mercy" Season 14 Episode 4 Promo - Firehouse 51 must band together after a devastating fire catches them off guard; Vasquez continues his quest for answers; Violet and Novak face an unexpected roadblock in the new training protocol. Subscribe to tvpromosdb on Youtube for more Chicago Fire season 14 promos in HD! Chicago Fire official website: https://www.nbc.com/chicago-fire/ Watch more Chicago Fire Season 14 videos: https://www.youtube.com/playlist?list=PLfrisy2KXzkeIFrKVGmCNVhdnYqrzenru Like Chicago Fire on Facebook: https://www.facebook.com/NBCOneChicago Follow Chicago Fire on Twitter: https://twitter.com/NBCOneChicago Follow Chicago Fire on Instagram: https://www.instagram.com/NBCOneChicago Chicago Fire 14x04 Promo/Preview "Mercy" Chicago Fire Season 14 Episode 4 Promo Chicago Fire 14x04 Promo "Mercy" (HD) #ChicagoFire #OneChicago » Watch Chicago Fire Wednesdays at 9:00pm on NBC » Starring: Taylor Kinney, Jesse Spencer, Eamonn Walker