Anger is like water in hydrological cycle. It changes its form from liquid to gas on heating and rises up fast. When it is high, it becomes cold and hence condenses to liquid again. A stage comes when the clouds can not hold more condensed water and it precipitates on others.
This cycle should go on as the balance of life is stimulated by the cycle. If one tries to hold on anger for long, it gets converted to depression or suppression. However if it is precipitated heavily, it becomes resentment or remorse for others.