Bills running back James Cook, who was an active participant in Buffalo’s practices when training camp began, switched to a hold-in strategy last week as extension talks with the team drag on, an approach that continued into the preseason opener.

James Cook emerged from the Highmark Stadium tunnel in full pads and uniform, putting a charge into the pregame summer air. The Buffalo Bills running back hadn’t worn any of his gear for a week. He wants a new contract and has applied his leverage by refusing to practice.