It happened, according to coach Adam Gase, because of the referees' point of emphasis that says it's a 15-yard penalty to land with your body weight on the quarterback.
Hayes leads the Dolphins with two sacks this season.
Plenty of negative externalities have already sprung forth from the NFL's bizarrely misguided new policies on contact, particularly when it comes to how defensive players tackle quarterbacks. Packers linebacker Clay Matthews has been hit with questionable calls in all three of Green Bay's games. He immediately writhes in pain on the ground, favoring his right knee before being helped off the field and into the locker room with a pair of trainers.
"It hurts", Gase said, later adding, "That's going to be tough one for us to swallow".
Hayes is one of the Dolphins' top defenders, and his loss is a significant blow for a team off to a surprising 3-0 start. Gase did not elaborate on whether he thought the new rule caused Hayes's injury.