It was a dreadful day for Chicago Bears head coach Matt Nagy, whose team could not get it done in the red zone all afternoon during its Week 8 matchup with the Los Angeles Chargers at home.

Crucially, Nagy, the second-year coach of the Bears, instructed his franchise quarterback Mitchell Trubisky to kneel to set up the potential game-winning field goal from placekicker Eddy Pineiro — a 41-yard kick that the undrafted free agent missed after previously making three kicks in the second quarter and missing a 33-yarder in the first period.

The Bears scored one touchdown on the day — a David Montgomery four-yard rush — and relied on Pineiro's leg to potentially lift the NFC North franchise to victory over the Bolts.

However, instead of the Bears running another play to gain a few more yards, or set up the field goal unit rather than take the three-yard loss on the former second overall pick's kneel, Nagy's instructions helped prove lethal for Chicago's winning chances considering how close Pineiro's kick was to the uprights. In other words, that three-yard margin may have been the difference in Pineiro's 41-yard field goal attempt winning the ball game for the Bears:

Sunday's loss to the Chargers marks Chicago's third consecutive loss. In a season that appeared bright from the beginning — a matured Trubisky, a top defense that includes Khalil Mack, a clever coach in his second year — Nagy's mistake looks to be a huge one in a catastrophic stretch for Chicago.