I'm on vacation right now so please excuse the bad spelling from my Phone and the occasional weird autocorrect or capitalization. In a Situation Like the one described, ideally the head Coach Doesnt even need to get involved. A Team that is functioning exceptionally Well would be able to self regulate and figure this out amongst themselves. The Captain and other Team Leaders might get involved to initiate conversation or Draw lines in the Sand and it would be made clear that Arguments Like the one Happening right now are hurting the Team as a whole. And that Team and the success the group ist chasing together is supposed to bei bigger than two squabbling individuals. However, that Kind of dynamic ist the exception, Not the Norm, and even intact Teams that are generally working Well together might need an authority figure to come in and Help resolve Things, If only by forcing a truce in the Parties involved. In Teams as big as a Hockey Team and its staff, Not everyone can get along with everyone, Sometimes peaceful coexistence between people who cant stand each other is all you can Hope for.