Zaos fought back and insisted on not losing his second weapon. He had the strength with magic to do that. However, he had enhanced his arms too much, and his muscles were starting to pay the price for it. In the end, Zaos decided to let his sword go… he was draining the mana of the enemy, and while he could fight using magic and a sword, he didn't have to combine them at the same time at every single opportunity.
After noticing that Drannor could no longer attack while he was dodging the massive hand of sand, Zaos decided that it was time to focus on magic. He never used that much, but he began to fire Thunder Swords toward Elisius' head in the end. While the spell didn't exist, he could create it just by increasing the amount of mana on Wind Sword.