NFL purists say he should not have been doing that. Here are some other things he could be doing, although "watch the game" is not on this list.

Philadelphia Eagles receiver AJ Brown got in a little reading during the birds' 22-10 victory over the Green Bay Packers on Sunday during a Wild Card round matchup.

But every head coach has different expectations of their players, particularly on what they should be doing on the sidelines. Yet, don’t expect Eagles coach Nick Sirianni to stop Brown from reading that book. In fact, he’s known about it for a long time now.