Hit as soon as he caught the ball and then fumbled the ball apparently equals "forward progress"
Lets go back 10 years to that catch by David Nelson against Baltimore where he was hoisted in the air for 3 seconds and then stripped of the ball for a fumble.
It's not often the bills will go up against a front 4 like they are today. They are getting the ball out quick underneath to eliminate their rush. It's a good game plan. Boring, but good.