Originally posted by zephiel7
Obi was still a padawan at the time, and not really a master of Soresu. After watching Qui gon die, I think that was the point when he began to perfect his skill in Soresu.
At that point in his life, Obi-Wan knew nothing about Soresu. His style when fighting Maul was Ataro. He switched to learning Soresu after Qui-Gon's death.