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CHICAGO, IL - NOVEMBER 09: Actors Eamonn Walker and David Eigenberg attend the on set demonstration of 'Chicago Fire' during the press junket for NBC's 'Chicago Fire', 'Chicago P.D.' and 'Chicago Med' at Cinespace Chicago Film Studios on November 9, 2015 in Chicago, Illinois. (Photo by Daniel Boczarski/Getty Images)

CHICAGO, IL - NOVEMBER 09:  Actors Eamonn Walker and David Eigenberg attend the on set demonstration of 'Chicago Fire' during the press junket for NBC's 'Chicago Fire', 'Chicago P.D.' and 'Chicago Med' at Cinespace Chicago Film Studios on November 9, 2015 in Chicago, Illinois.  (Photo by Daniel Boczarski/Getty Images)