<P> There are several informal rules governing fighting in ice hockey that players rarely discuss but take quite seriously . The most important aspect of this etiquette is that opposing enforcers must agree to a fight, usually via a verbal or physical exchange on the ice . This agreement helps both players avoid being given an instigator penalty, and helps keep unwilling participants out of fights . </P> <P> Enforcers typically only fight each other, with only the occasional spontaneous fight breaking out between one or two opponents who do not usually fight . There is a high degree of respect among enforcers as well; they will respect a rival who declines a fight because he is playing with injuries, a frequent occurrence, because enforcers consider winning a fight with an injured opponent to be an empty victory . This is also known as granting a "free pass". Enforcer Darren McCarty described fighters as being divided into "heavyweights" and "light heavyweights", and said that players in the former category "end up dancing with some guys who could end (their) career with a single punch ." </P> <P> Long - standing rivalries result in numerous rematches, especially if one of the enforcers has to decline an invitation to fight during a given game . This is one of the reasons that enforcers may fight at the beginning of a game, when nothing obvious has happened to agitate the opponents . On the other hand, it is bad etiquette to try to initiate a fight with an enforcer who is near the end of his shift, since the more rested player will have an obvious advantage . </P> <P> Another important aspect of etiquette is simply fighting fairly and cleanly . Fairness is maintained by not wearing equipment that could injure the opposing fighter, such as face shields, gloves, or masks, and not assaulting referees or linesmen . Finally, whatever the outcome of the fight, etiquette dictates that players who choose to fight win and lose those fights gracefully . Otherwise, they risk losing the respect of their teammates and fans . </P>

When are you allowed to fight in hockey