FORT WORTH - Sonny Dykes was fuming after a Shane Buechele interception in the second quarter. The Mustangs had just recovered their third turnover of the game.

But after Buechele's interception in the endzone two plays later, head coach Dykes was extremely angry at the referees and not his quarterback. He needed to be restrained by assistant coaches. It wasn't the play he appeared to be mad about. It was likely because one of his players' helmets appeared be thrown down the field by a TCU defender after the helmet came off.

"I saw the helmet flying through the air, and nobody else saw it," said a much more calm Dykes after a 41-38 SMU win over No. 25 TCU. "I was a little upset about that, but hey it is what it is."

The moment occurred away from the play, but none of the officials noticed what had happened. TV cameras picked up the play, but the people involved were difficult to detect. Dykes said he couldn't tell who threw the helmet, either.

Game-changing moment in SMU-TCU:



On a 3rd down that ended in a Buechele INT, a TCU player ripped off an SMU player's helmet then threw it 15 yards downfield toward the endzone.



No flag. Sonny Dykes was hot.



The next play TCU's Darius Anderson goes 77 yards to set up a TD. pic.twitter.com/ZYgsjR3NtP — Joey Hayden (@_joeyhayden) September 21, 2019

The unsportsmanlike conduct no-call could be seen as a major momentum shift in the game. TCU scored just a few play later after running back Darius Anderson broke a long run into SMU territory.

"It was a hell of a throw, it went about 30 yards," Dykes said. "You gotta try and go do that some time, see how far you can throw a helmet."