Brown on Monday repeatedly said he took full responsibility for the team's performance against James Madison, but he also put it on his assistant coaches to do a better job of preparing players. He said the team is fully focused on this week's matchup against undefeated Duke — a program led by Manny Diaz, whom Brown fired as the Texas defensive coordinator less than 24 hours after the Longhorns allowed 550 rushing yards to BYU Cougars in a 2013 loss.