Another ugly chapter has been added to the Michigan-Michigan State football rivalry

As if this rivalry wasn't heated enough, Michigan and Michigan State football stoked the flames over the weekend and another ugly chapter was added to the lengthy book on Saturday night.

Two years ago, the tunnel incident was just the latest ugly chapter in the rivalry which has seen dirty hits, suspensions, players twisting facemasks in the bottom of piles, players jumping on a guy while he's laying on the ground, and pre-game scuffles that lead to defacing a midfield logo.

Both sides have been guilty of adding ugliness to the rivalry and both should be held accountable again for what happened on Saturday night.

However, it was Kalel Mullings that may have taken things too far and if that's the case, he should be held accountable like the eight players in the tunnel two years ago.

Following a shoving match between Anthony Jones and Colston Loveland, the camera panned to what looked like a scuffle in what should have been a post-game handshake area between Mullings and a Michigan State staffer or player who was on the ground.

There's some missing context and no one really knows what happened on the ground or between Mullings and that staffer, but it didn't look good for the Michigan running back.

But a precedent was set by Jim Harbaugh two years ago when he asked for criminal charges for all eight Michigan State players involved in the tunnel incident. Fortunately for Michigan, Alan Haller is not interesting in charges but rather accountability like his program took. He wants Michigan to be held to the same standard as everyone else and is working with the Big Ten to speak about a potential punishment if Mullings is found to have done something wrong.

Here we are, two years after saying the hateful rhetoric needs to be toned down because of what happened and then there's a video of a player possible kicking someone on the ground.

The ugly chapters being added to this rivalry's book are never-ending.