At 3:16 in
this video you can see that Stevie beats both shallow guys and the safety way too far out of position in order to defend him. Bills win if Fitz makes an accurate throw to him.
This screen capture (pretty bad quality) comes with the ball still in Fitzpatricks hand. Stevie wide open in the blue circle. Other two red circles are open players as well, CJ and I think DJ. So Fitz had 3 open receivers and two covered receivers, one being Chandler and the other Graham. He makes the worst possible decision and throws it to the covered rookie. Every other option would have been better. That's what we are dealing with. And I've made a lot of excuses for Fitz, but he freaked out and choked.