Having seen all of the episodes of Chicago Fire and having seen every crossover episode of the three shows and I had watched the pilots of P.D. and Med and the season finales of P.D. and Med, and then all the episodes of Chicago Fire.
Even though I knew I was paired with Chicago Med I still watched all the shows, because of course there are crossovers.
‘Oh, I get to direct an episode of Chicago Fire that’s one part of this vast world of storytelling!
Obviously Chicago Fire has been on the longest and Derek Haas created the show and he actually wrote my episode.