These sorts of things have been happening since day dot in team sports, as long as its not a symptom of something deeper, and they shake hands and its left at that, no problem with a blow up occasionally.
at my rugby club one night late in pre season during scrum practice 1's vs 2's, both packs erupted into an all in brawl, until calmer heads prevailed. The funniest thing is it started with 2 brothers throwing the first few punches at each other.