Again, that pass isn't really on Fields or Olave. It is a symptom of how the offense has been all year. Fields still needs a lot of refinement as a passer. He has been fortunate to have a great deal of time to find his 2nd and 3rd options throughout the season. If they haven't been available, he has either bought time with his legs as expected, or taken unnecessary sacks. The problem when you're the receiver is reliability/predictability. If I can expect you as a QB to slide in the pocket and find the open window, then I'm not going to start my scramble drill yet. But if you've had spotty plays with that all season including the game we're currently playing, then I'm going to break the route off early and work my way open because you've shown a tendency at times to drop your eyes, find open space, then look up for the throw. Which is something JF has done all season.
It was Fields standing tall and throwing with anticipation in a pocket after having time to throw then needing to slide his feet and 'drift' from pressure. Something he has struggled with at points during the back 9 of this season. If that wasn't the case, then I'm almost 100% positive Chris would have kept his route going across the DB and that would have been a TD.