I for one have no understanding of 'the code' ice hockey players and officials go by when it comes to fights but it's interesting to compare this ref cam video from an AHL (minor league hockey) game with the ref cam in rugby.
Also, the ref spends most of the time trying to not get knocked over himself. Rather him than me.
http://www.youtube.com/watch?feature=player_embedded&v=ZEBoOr12BrI
hat-tip: Sportsgrid