If you are going to react, attack the message and not your counterpart personally. Don't get angry. When you become angry, your counterpart has gained control in triggering your response. In the angry mode, you are probably not in the best frame of mind to make the best decisions. Emotions of any kind hinder the listening process.
Anger especially interferes with the problem-solving process involved in negotiations.
When you are angry, you tend to shut out your counterpart. If you are going to get angry, do it for the effect, but retain control of your emotions so you can keep control of the negotia- tions. The effect worked well for him. Remember, it is impossible to listen and speak at the same time. If you are speaking, you are tipping your hand and not getting the information you need from your counterpart.