有上边空下边打一字谜

Liang Kexin's endless light dimmed instantly, and she was once again blasted out. This time, several mouthfuls of blood were spurted out of thin air. In just one blow, she was seriously injured. Fortunately, her light once again blocked the ghostly face and claws of the Explosive Flame Ghost Claw, otherwise she would definitely die, and she would definitely not be able to block the third blow....