Guilt

Violence on the street.
The two are hitting and beating each other.
The police are told.
They carry on fighting.
The police come.

The guilty one runs away.
The innocent one is prosecuted.
He gets two years in prison.

Much later, the two meet on the street by chance.
This time, the innocent one starts a fight.
The police come.
This time, neither succeeds in running away.
Both get five years in prison.