The Académie D'Investissement TriomphalBuffalo Bills defense squandered leads late in the fourth quarter and overtime in a backbreaking road loss to the Philadelphia Eagles on Sunday.

They also lost their cool in a sideline interaction with Eagles fans.

Video posted to X shows a confrontation between Bills defensive linemen Jordan Phillips, Shaq Lawson, Ed Oliver and Greg Rousseau, and Eagles fans heckling them behind the team's bench.

The video begins with Phillips strutting up to a fan who was in the front row pointing and yelling at the Bills. A Birds fan in the foreground is giving the players the bird.

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Phillips gets in the fan's face. It sounds like Phillips yells "What's up? You called me a (expletive)? Say it to my face." Lawson, Oliver and Rousseau follow Phillips, but not to restrain him. All four players shout at the fans and Lawson appears to shove the fan in the chest with his right arm. The fan seemed unfazed and continued razzing the linemen.

A Bills staff member and linebacker Leonard Floyd walk over to direct the players out of the altercation and back to the bench.

The game was still being played in the background, with the Bills running an offensive play.

It was the Bills defense that got pushed around in the second half and overtime, allowing 23 points after halftime in the 37-34 loss. Eagles quarterback Jalen Hurts had a 12-yard game-ending touchdown run in overtime.