Marshawn Lynch was protecting Kansas City Chiefs cornerback Marcus Peters when the Oakland Raiders running back ran off the sidelines and onto the field in the middle of a melee in the Raiders' 31-30 victory Thursday, said Raiders left tackle Donald Penn.

Peters had just been flagged for a late hit on Raiders quarterback Derek Carr with 6:05 to play in the second quarter when Penn, left guard Kelechi Osemele and right guard Gabe Jackson went after Peters, prompting Lynch's sprint.

"You know, Marshawn is his cousin, man, they're like brothers," Penn told ESPN SportsCenter's Michael Eaves on Friday.

"Marshawn was just trying to get his cousin and make sure his cousin was safe because Marshawn saw three big O-linemen going after his cousin and Marshawn knows how we get down as offensive linemen. And he knows how his cousin gets down, so I think he was just trying to stop something from getting bigger than it was. He didn't know if a punch was going to get thrown or if it was going to blow up. I think he was just trying to get in there to get his cousin to the sideline, get things safe, get us back playing."

But in rushing to the scrum, Lynch was met by officials, and Lynch responded by bumping line judge Julian Mapp in the chest and then grabbing Mapp by the jersey before letting go.