Renewed push to protect QBs has defenders stumped

Green Bay Packers' Clay Matthews is called for a roughing the passer penalty during the second half of an NFL football game against the Minnesota Vikings Sunday, Sept. 16, 2018, in Green Bay, Wis. The game ended in a 29-29 tie. (AP Photo/Mike Roemer)

Pass rushers like Clay Matthews are stumped as to what constitutes a clean hit on quarterbacks anymore. Lending a sympathetic ear is none other than Mike Zimmer, one of the biggest beneficiaries of the league’s renewed emphasis on protecting the passer.