It's so ridiculous. In hockey, if someone gets hit by a slapshot in the face, you don't get an open slash to the back of the leg. The retaliation in hockey is always on intentional acts and is usually an even 1 on 1 fight. Football I have really seen any retaliation for even intentional acts. When Suh stomped on EDTS, its not like Jarret Bush went and hit someone out of bounds on the next kickoff. And basketball, when Bogut ended his season when someone walked under his dunk, its not like Brandon Jennings threw a ball at someone's head during the next inbound pass. It's a pretty ridiculous practice that's excused by the same rationale hazing is excused... "Its tradition, man"