Fuji makes some reasonable points in his arguments. However, when he gets into difficulty he slips into a mode where he ceases arguing rationally. He will then succumb to a number of techniques, the most common of which is "I'm right , you are wrong" which needless to say accomplishes little! I guess it makes him feel like he actually is right, bu tto me it is a sign of immaturity. He will similarly assert that you have 'admitted you are wrong", or "you are backpedalling" or other assorted nonsense. He also likes to do a little name-calling, saying your ideas are stupid etc without actually proving them so. That kind of thing is just a waste of words.
Finally, some things are open to interpretation. He will take extreme interpretations for proving his point of view, which we are obligated to accept, yet he then refuses to accept the possibility of other interpretations.
In short, I find him to be a poor debater.