The memo, as Lions reporters have noted, used video of Campbell and not of 49ers defensive lineman Alfred Collins, who punched Kyren Williams in the helmet, turning his head, before punching out the ball on the 1-yard line. The 49ers recovered the fumble and won the game.

In talking to reporters on Wednesday at 49ers practice in Santa Clara, Warner elaborated on Collins’ special highlight. “Let me just say that, I’ve had a lot of punch-outs in my career, and I’ve never had one of that magnitude in that kind of ...