To make two of the jedis to fight you must do the following thing. First off,You have to be the rebellion og the galactic empire.Next, you must make sure that both teams have the jedi hero bonus on. This is EXTREMELY important.When the game starts choose the "follow me"command(default F2 on your keyboard) and lead the jedi to the other jedi an they will fight.They won`t kill each other but they wiill kill everyone within a cetain radius of the battle, so I advice you to stay well out of the way.