Toz couldn't wait until the next jellyfish appeared. After he had finally gotten to see the results of his fireball striking something, he received a burst of inspiration on how to improve it the next time. The explosion was powerful but also unnecessarily flashy. The width of the fireball's explosion could be handy when dealing with a bunch of enemies. However, if Toz attacked a single enemy, mightier than anything he had faced previously, the rain of flames would do more harm than good since it blocked his view of his opponent.
There was also the aspect of the fireball's slow flight. Although Toz had other means of attacking which were more suited to high-speed combat, none of them were as powerful as his fireball. The darkness spell he was working on was in second place, but it was still lacking in usability compared to the fireball.