After concentrating on his battle with Dristel and making sure not to get impaled by the wind javelins, Toz then focused on fusing the two elements. So he had inadvertently relaxed his mind a little too much after launching his grey flames at Dristel's ship, which was why the attack arrived right when he noticed it.
Toz hadn't expected anyone to interfere in his battle just yet since all the crew members were half-dazedly, barely managing to sit up, much less contribute to a battle on the level of the one between him and Dristel. Their fight had been overwhelmingly simple from an outside perspective, with spells and techniques flying back and forth with no apparent immediate danger to either party.
