Mike Carter-USA TODAY Sports

Michigan State's defense is taking on a Jekyll and Hyde personality over the past few weeks and it happened again on Saturday against BYU.

The past three weeks have seen Michigan State's defense plays like Jekyll before turning into Hyde in the second half. It happened again on Saturday against BYU and Spartan Nation went to defensive coordinator Harlon Barnett on the subject. What did Barnett have to say about the issue?

The Michigan State Spartans defense has become a tale of two halves this season and Spartan Nation put Spartans defensive coordinator Harlon Barnett on the spot following the Spartans loss to BYU on Saturday afternoon.

After shutting down the Cougars in the first quarter and limiting them to only a late field goal in the second, the Spartans gave up 28 points during the final two quarters losing to the independent program 31-14.  The biggest home loss since the Spartans fell to Ohio State by 12-points in 2014.

However, if you look back at how the Spartans defense has played the past few weeks, you'll see a pattern forming as the Spartans gave up 21-points last weekend to Indiana and 17-points to Wisconsin, the week prior in the second half.

Overall the past three weeks the Spartans have been out scored in the second half 66-21 as losses continue to mount on a team many felt would have one of the top defenses in the Big Ten Conference.

How did Coach Barnett respond to Spartan Nation’s question on the struggles of the defense in the second half, especially this week when Malik McDowell entered the game after sitting out the first half from a targeting call against Indiana?

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