Aconflict resolution manual calls on "the first disputant " to state his/her case what does disputant mean in this context?

In areas like political or social debates, a disputant is the person who takes part in a dispute. In words put simply, a disputant is a debater. He/she states her arguments on significant world problems or issues based on his/her experience, research and moral principles. When there is a conflict resolution, it means that there is an agreement reached by the two disputants or debaters. 

Give examples, people who actually harmed.