Near the end of the second period, McAvoy and Pastrnak went to talk to Kozari about a call they didn't agree with. But instead of calmly discussing it, Kozari got really upset. He grabbed McAvoy and started shouting at him, which was quite surprising for everyone watching.
We don't know exactly what McAvoy and Pastrnak said to Kozari, but whatever it was, it really got him riled up. His reaction showed just how intense the moment was.