Steelers HC Mike Tomlin needed to be separated from Bengals safety Reggie Nelson after heated exchange

Le'Veon Bell exited Sunday night's game against the Cincinnati Bengals with a hyperextended knee suffered from a low hit from Bengals safety Reggie Nelson. He didn't return, and only finished with 20 yards on eight carries.

After the game, Steelers head coach Mike Tomlin and Nelson got into it during post-game hand shakes. But there was no love between the two guys. Tomlin and Nelson needed to be separated by Bengals head coach Marvin Lewis.

During his post-game press conference, Tomlin said the exchange wasn't a result of Nelson's hit but rather over a game of he said, she said.

Tomlin is a pretty fiery guy and I could definitely see him throw hands if Lewis didn't step in.

Earlier in the game, Tomlin graced us with this amazing chest-pounding GIF. I think what we learned here is don't mess with Mike Tomlin.