The refs, the 2 guys w the orange armbands, don’t get involved at all, other than keeping guys from committing a “3rd man in” situation.
The two linesmen will let the fight go until the participants are spent or one participant appears injured. Generally if a hockey player knows he has gotten the better of his opponent (bloodied nose, lost teeth, impending unconsciousness) they’ll back off.
As a side, how’d this end up in the Pels thread?