The fight doesn't last long, and isn't heavy on punches, but Crosby delivered some hard cross checks to Krebs, and showed he was more than willing to drop the gloves. The referees quickly separated the players as they fell to the ice.
It's a rare sight to see if Crosby fighting, one of the greatest players of his generation, especially in a preseason game. It seems like Crosby is setting the tone for the season that Penguins players will have each other's backs, and will take exception to dirty plays. With that mentality being led by Crosby, the entire team will have to buy in.