And Miami was very much anomaly for this defense when it comes to pass yards allowed in the 2nd half.
I took a closer look at the Patriots defensive stats grouped by half and it's fairly clear just how much game planning and halftime adjustments are done.
1st Half: 66.9% passing, 933 yards, 7.5 Y/A, 94 runs, 310 yards, 3.3 Y/C, 47 points
2nd Half: 62.3% passing, 952 yards, 6.3 Y/A, 76 runs, 336 yards, 4.4 Y/C, 60 points
The difference becomes even bigger if we take out the entire Miami game where the defence played great in the first half and absolutely sucky in the second.
1st Half: 68.9% passing, 819 yards, 7.7 Y/A, 85 runs, 277 yards, 3.3 Y/C, 44 points
2nd Half: 58.1% passing, 679 yards, 5.5 Y/A, 69 runs, 299 yards, 4.3 Y/C, 39 points
The 5.5 yards per attempt reached in the second half would tie Minnesota for the lowest of the league. But of course one shouldn't compare a full game's stat against a split of a half. Just want to give an indicator of how good that value is. And even if we take net yards per attempt (which factors in lost yardage due to sacks) the second half value of 5.0 is still good enough that over a full game only Minnesota at 4.8 is better.
Translated into per game numbers that would be:
1st Half: 137 yards passing, 46 yards rushing, 7.3 points
2nd Half: 113 yards passing, 50 yards rushing, 6.5 points
Of course it also has to be said that aside from the Buffalo game the Patriots were up at halftime against all the other opponents, so it was possible for the team to specifically key in on the pass. However, it also has to be mentioned that no QB has put together two good halves passing against the Patriots:
Landry Jones
1st Half: 14-20, 179 yards, 9.0 Y/A (Run game: 10 runs, 40 yards, 4.0 Y/C)
2nd Half: 15-27, 102 yards, 3.8 Y/A (Run game: 12 runs, 54 yards, 4.5 Y/C)
Andy Dalton
1st Half: 13-16, 143 yards, 8.9 Y/A (Run game: 17 runs, 50 yards, 2.9 Y/C)
2nd Half: 8-15, 111 yards, 7.4 Y/A (Run game: 15 runs, 70 yards, 4.7 Y/C)
Carson Palmer
1st Half: 10-16, 137 yards, 8.6 Y/A (Run game: 12 runs, 36 yards, 3.0 Y/C)
2nd Half: 14-21, 134 yards, 6.4 Y/A (Run game: 7 runs, 56 yards, 8.0 Y/C)
Tyrod Taylor
1st Half: 17-22, 166 yards, 7.6 Y/A (Run game: 16 runs, 88 yards, 5.5 Y/C)
2nd Half: 10-17, 81 yards, 4.8 Y/A (Run game: 16 runs, 46 yards, 2.9 Y/C)
The funny thing here now is: They are doing all that in the second half despite sacking the QB
less in the second half than in the first. The team has 6 sacks in the first half (to 106 passing attempts without Miami, 124 with) and 5 sacks in the second half to 124 passing attempts without Miami and 151 with.