I've been wondering about this.
It almost seems like a deliberate plan for the defense to play to " keep it close" the first half, keep the players fresh. Then they unleash in the second half after the opposing offense has worn themselves down.

Or maybe it's just coincidence.

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Speed_Kills

I tell you what would help this defense a ton.. is to get a lead. The Rams defense clearly has a switch they turn on in the second half and its been consistent across all of their games with the possible exception of the Giants