Too often conflicts are fed in a positive feedback way. Aggression in one party excites "defensive" aggression in the other party. So matters escalate into a conflict even though neither party believes that the conflict mode will solve anything. 6/5 is a sort of "time-out" mechanism or safety valve. It is a suggestion from one party that the conflict mode is neither essential nor very constructive. Once the codes are in common use both parties will want to be the first to suggest code 6/5. It may be that the other party will refuse to respond to the code signal. That is always possible with any means of "de-confliction". If there is no response the code will have been used in vain. This is no great loss. The signal has been given.