His insults could raise teh ablities of his friends, even against mindless monsters. An ooze is scary untill you reveal that it is only a moving pile of musturd or somthign to that effect. Also, as a high level abiltiey you can insult people just by the tone of your voice, and mabe lower their chrisma and int mondifeir. What if you have an ablity that makes them go into rage, regarless of class. Works for enemies and friends. Or an abilty that makes them stunned (aka, crying from the emotional scars you gave them.
In real life, insults are one of the greatest weapons invented
From,
EE