Then and there, midway through the game, Davis made a decision to quit and retire.
Davis signed a one-year deal with the Bills worth up to $5 million, and $3.5 million of it was guaranteed.
Davis started the game, but he wasn't spotted on the field or sidelines after the second half.
Buffalo were trailing 28-6 at half-time, although they partially recovered - sans Davis - to earn a more respectable 31-20 defeat.
Hazard can be Premier League top-scorer, says Chelsea’s Sarri
And the 27-year-old paid tribute to the Frenchman for creating his first two goals at Stamford Bridge on Saturday. Hazard's first two goals came from layoffs by Olivier Giroud .
Bills linebacker Lorenzo Alexander told reporters after the loss that Davis actually quit playing football at the half, effectively telling the Bills that he had enough. "When I get back there (to the locker room), we'll continue to communicate and get things figured out".
After the game, Davis released a statement confirming his retirement and explaining his decision.
"But I hold myself to a standard". Mentally, I always expect myself to play at a high level. There were roadblocks and pitfalls along the way, but I am grateful to God for all of it because he doesn't promise any of us an easy journey.