FOXBOROUGH — Harold Landry III was a menace in his Patriots debut.

The 29-year-old edge rusher sacked Geno Smith 2.5 times and registered 7 pressures . The Raiders quarterback was under siege all afternoon in New England’s 20-13 loss. Landry’s breakout performance may have taken fans by surprise, but it didn’t catch Patriots outside linebackers coach Mike Smith off guard.

“Things I saw all of training camp,” Smith said. “He’s got explosive get off. He was mixing in his power. Making guys set him normal. And just how aggressive he plays. He’s a smart guy. He knows how to rush. He knows how to set them up. He’s a student of the game. Man, he studies. We talk about it all week.

“He reads off his report (in meetings) and it’s detailed. He’s a smart kid. You can tell he puts the time in.

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