the role that involves playing one member against the other for his or her own advantage would be: the third that rejoices
When a team only consist of two members, whenever there is conflict, only those two members will experience the result of the conflict.
When a team consists of three members on the other hand, if two members engage in a conflict, the third member who did not involve usually the one that gain the most benefit. This occurrence is called the third that rejoices.
