The only lame part was that two bottom dwelling teams bothered to fight in a meaning game in an empty arena.
Otherwise, Knyzhov and Foligno were just playing the tough guy game within the game. Initiate extra contact to gain a physical edge in the game. Do what you can get away with. But, if it gets called out, duke it out and call a temporary ceasefire on the dirty play.
Knyzhov didn't necessarily have to escalate it immediately. He could have just finished some checks on Foligno or did a little dirty on his own. But, he's a young guy and that's the route he chose. Even though he lost the fight, it builds his rep as not the easiest target.