What happened: Buffalo Bills running back James Cook, who paced the NFL at 6.0 yards per rush earlier this season, was fined $21,167 for impermissible use of the helmet during Week 5, per Mike Garafolo. On-field officials did not throw a flag on the play. Across the league, the NFL issued six total fines for use-of-the-helmet violations from the Week 5 slate.

Why it matters: The assessment underscores the league office's continued enforcement of helmet-contact rules via postgame video review regardless of whether a live penalty is called. In the same round of Buffalo discipline, linebacker Bradley Chubb was fined $14,329 for taunting during a postgame exchange with Rams tackle Alaric Jackson.

What to watch: Cook can appeal the financial penalty through the league's standard hearing process while remaining fully available for Buffalo's upcoming game.