Trick against trick.
More German Proverbs:
If a man would know what he is, let him anger his neighbours.German
The master's eye does more than both his hands.
German
The executioner is a keen shaver.
German
He who has no shoes dances in his socks.
German
Small profits and often, are better than large profits and seldom.
German
Women are as fickle as April weather.
German