ORCHARD PARK, N.Y. — Here is the complete timeline of a single mouthful of fluid, from field to file:

Sunday, 8:26 p.m. — The Buffalo Bills are playing the Las Vegas Raiders at Allegiant Stadium. The Raiders are preparing to kick an extra point. Nobody in the building knows that history is about to require a mouthguard for a different reason.

8:28 p.m., with 1:32 left in the game — The NFL’s notice later describes an “unsportsmanlike conduct” incident immediately after the extra point: a Buffalo defensive back spitting at an opposing player. The play clock moves on. The game moves on. The spit, as it turns out, is just getting started.

Monday through Tuesday — The league reviews the film. A second Bills safety, from the same game, is suspended one game for a separate spitting incident. The Buffalo locker room is informed that it has, in one calendar week, produced a small movement.

Wednesday, 12:05 p.m. — Sam Franklin Jr., the second safety, is formally suspended one game without pay. He has reportedly forfeited $81,111. He denies the allegation and intends to appeal, which is a bold and beautiful thing to appeal: the league watched the tape, and the tape watched back.

Wednesday, 12:07 p.m. — Water coolers across the National Football League become, briefly, the most scrutinized objects in professional sports.

“It’s hydration,” said Marcus Whitcombe, a college special-teams coach who has coached against Buffalo twice and considers this “a gray area with a wet edge.” “You’re out there in a stadium, you’re sweating, your mouth is dry. Sometimes the body just… files a grievance. Nobody’s proud of it. But you can’t suspend a body for being a body.”

The league can, in fact, and has, twice, on the same team, in the same game, at roughly the same hour of the evening, which is the kind of pattern statisticians call “not a coincidence” and publicists call “a teaching moment.”

By Thursday morning, practice at One Bills Drive had resumed its normal rhythm: pads cracking, whistles, and one position coach walking the sideline with a water bottle held, visibly and deliberately, at chest height — neither drinking nor discarding, just holding it there, for everyone to see, like a lantern.