At such a close range, pitting a magician against an archer was unfair to begin with. The magician needed time to chant, but this sudden arrow hadn't given Xuan Yue any time at all.
Xuan Yue pushed Ah Dai away, who was about to take action, gently waved her magic wand and in an instant, as the silver arrow was about to strike her, a strong light suddenly appeared. When everyone regained their vision, they found that Yue Ji was fully enveloped by a layer of light. No one but Ah Dai saw what had happened.