Loud explosions boomed as the large white bone claw clashed with the fire column coalesced from lava. But Canary and Di weren't concerned about the result of their clash. On the contrary, they made spell-casting gestures with their hands immediately after casting their earlier spells. The most important things about duels between spell casters were damage, speed, and accuracy. In 'anime', two people fired beams and competed against each other to see who could last the longest, but it was meaningless in this case. Not only must a top spell caster grasp the proficiency, speed, and mastery to cast spells in the shortest time possible, but one must also anticipate whether the next spell was offensive or defensive and come up with a corresponding response. From a certain aspect, the duel between two top spell casters was like gambling. While one grasped the card in one's hand, one must also guess what card the opponent held and make the right call.