A good game spirit must be shown between opponent teams when playing soccer. Thus, to congratulate and shake hands is an example of a display rule.
Soccer players sometimes injure one another during a game, or can engage in an act which can lead to an offence on the other part. These does not make the players to be enemies.
The game requires a fair play and good game spirit among players no matter the outcome (result) of the game. Thus it is one of the rules, though not mandatory, for soccer players to congratulate one another or shake hands.
This best exemplifies a display rule which implies that either of the team winning or losing a game does not turn opponent team to an enemy. This act is displayed especially after a game without any hindrance to it.
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