Sean McDermott shoos Bill Belichick's son off field during Bills' pregame warm-ups

Even in defeat, the Buffalo Bills created plenty of drama in the AFC East during their loss to the New England Patriots. As it turns out, even more drama came before the game.

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As the Bills ended their pregame warm-ups, head coach Sean McDermott noticed a pair of Patriots staffers lurking on the sidelines. An angry McDermott soon yelled at the two to get off the field.

Adding to the intrigue is that the younger of those Patriots staffers is Brian Belichick, a coaching assistant for the Patriots and the son of Bill Belichick.

It’s worth noting that the Bills’ New Era Field only features one tunnel to both locker rooms, and the Bills warm up right in front of that tunnel. So the Patriots staffers weren’t suspiciously out of place, McDermott just didn’t like them lingering.

See photos from the game: 

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NFL Week 4: Patriots vs. Bills
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NFL Week 4: Patriots vs. Bills
New England Patriots defenders Jonathan Jones (31) and Duron Harmon (21) tackle Buffalo Bills quarterback Josh Allen (17) in the second half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. Allen left the field after the play. (AP Photo/Ron Schwane)
Buffalo Bills quarterback Matt Barkley passes against the New England Patriots in the second half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Adrian Kraus)
New England Patriots wide receiver Julian Edelman runs after catching a pass in the first half of an NFL football game against the Buffalo Bills, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
Buffalo Bills quarterback Josh Allen dives over the line of scrimmage to score a touchdown against the New England Patriots in the second half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Adrian Kraus)
Buffalo Bills tight end Dawson Knox (88) catches a pass in front of New England Patriots safety Patrick Chung in the first half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
Buffalo Bills safety Micah Hyde intercepts a pass in the end zone, thrown by New England Patriots quarterback Tom Brady, in the first half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
New England Patriots quarterback Tom Brady passes against the Buffalo Bills in the first half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
Buffalo Bills quarterback Josh Allen fumbles as he is tackled by New England Patriots linebacker Kyle Van Noy in the first half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. The Bills recovered the fumble. (AP Photo/Ron Schwane)
Buffalo Bills quarterback Josh Allen tries to break free from the grasp of of New England Patriots defensive tackle Lawrence Guy in the first half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
New England Patriots' Matthew Slater celebrates his touchdown after recovering a blocked punt in the first half of an NFL football game against the Buffalo Bills, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
New England Patriots running back Brandon Bolden celebrates his touchdown run against the Buffalo Bills with James White, rear, in the first half of an NFL football game, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
New England Patriots quarterback Tom Brady gets fired up up before an NFL football game against the Buffalo Bills, Sunday, Sept. 29, 2019, in Orchard Park, N.Y. (AP Photo/Ron Schwane)
ORCHARD PARK, NY - SEPTEMBER 29: Buffalo Bills Quarterback Josh Allen (17) on the field after getting hit in the head during the second half of the game between the New England Patriots and the Buffalo Bills on September 29 ,2019, at New Era Field in Orchard Park, NY. (Photo by Gregory Fisher/Icon Sportswire via Getty Images)
ORCHARD PARK, NY - SEPTEMBER 29: Buffalo Bills wide receiver John Brown (15) holds onto the ball for a reception during the fourth quarter. The Buffalo Bills host The New England Patriots at New Era Field in Orchard Park, NY on Sept. 29, 2019. (Photo by Barry Chin/The Boston Globe via Getty Images)
ORCHARD PARK, NY - SEPTEMBER 29: New England Patriots quarterback Jarrett Stidham (4) kicks a field goal in the third quarter. He missed an extra point early in the game. The Buffalo Bills host The New England Patriots at New Era Field in Orchard Park, NY on Sept. 29, 2019. (Photo by Barry Chin/The Boston Globe via Getty Images)
ORCHARD PARK, NY - SEPTEMBER 29: New England Patriots wide receiver Josh Gordon (10) is knocked out of bounds just short of the goal line during the third quarter. The Buffalo Bills host The New England Patriots at New Era Field in Orchard Park, NY on Sept. 29, 2019. (Photo by Barry Chin/The Boston Globe via Getty Images)
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It's unclear what rule McDermott felt the Patriots were running afoul of, but you have to imagine a good amount of NFL coaches don’t take kindly to opponent watching their warm-ups, especially when that opponent is the Patriots. They kind of have a history of looking where they shouldn’t.

McDermott would later become even angrier during the Bills’ 16-10 loss to the Patriots when New England cornerback Jonathan Jones laid a brutal helmet-to-helmet hit that knocked Buffalo quarterback Josh Allen out of the game. McDermott questioned why Jones wasn’t ejected after the game, and said the hit had no place in football.

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