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Anyone who was watching the Buffalo Bills-Denver Broncos game Sunday may have noticed a questionable celebration—by the referees.

Denver running back C.J. Anderson scored a one-yard touchdown in the second quarter to give his team a 14-3 lead. Anderson and the Broncos had reason to celebrate, but it was a bit strange that the referees decided to bump fists after the play.

Bills safety Aaron Williams saw what the refs did and didn't think it was appropriate.

However, the NFL didn't have an issue with the fist bump.

"It was an acknowledgment of good mechanics between the two officials involved in making the call," NFL spokesman Michael Signora said, per ESPN.com.

It sounds like one ref apparently thought the other did a good job in signaling a touchdown. If that's the case, just use words. A gesture like this could look a bit shady to the Bills and to viewers.

On Monday, Williams still felt strongly about the situation. He talked to The Associated Press, via ESPN.com, about the possibility of getting fined.

"I don't care if I do get fined," Williams said. "I speak the way I feel, and that's the way I feel."

Buffalo cornerback Corey Graham said that it wasn't a "good look" for the officials, but he didn't get too upset about what happened.

"I saw it. I don't think it was nothing crazy as far as 'Happy that they scored a touchdown,'" Graham said. "It was more of probably just, 'We got that one right.'"

Denver held on for a 24-17 victory over Buffalo.

[Aaron Williams]