Then I hope the grades for the Pats/Bills game fail on all the missed DPI and incorrect OPI calls.The NFL will grade that DPI call as correct. They want the flag anytime the DB uses his hands to prevent a receiver from getting two hands in the air. While obviously it didn't affect stride, he was grabbing (and maintained the grab for several steps) the wrist of the receiver. That's subtle, that's taught, and that's a foul