ALLEN PARK — Detroit Lions defensive coordinator Kelvin Sheppard admitted he was “pissed” after his defense gave up 27 points in Sunday’s opener against the Green Bay Packers at Lambeau Field.

But like a lot of the chatter coming out of the team facility this week, Sheppard emphasized he’s not as discouraged after having some time to digest the performance. According to Sheppard, the metrics out of Sunday’s game were encouraging — even if the Lions ‘ offense couldn’t match them, resulting in a 27-13 loss to begin the season .

Sheppard acknowledged some necessary areas of improvement while making the case his defense truly did buckle down in the second half of Sunday’s game.

“Coming off the field, you guys know, ultra-competitive nature of the game. My temperament and things, I was

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