Qui-Gon: Who taught you to fight like that?
Obi-Wan: What do you mean?
Qui-Gon: Students in the Temple rarely attack so viciously. They learn to defend, to wear one another down. They conserve their strength. Yet you fought… like a very dangerous man. You left yourself open to attack time and again, and relied upon the other boy to take the defensive stance.

-Jedi Apprentice: The Rising Force