Instead of attacking her from afar, Ray chose to run after her so he could drain her blood, half of all the men he attacked had their blood drained, Ray used one of his spears to fight while the other one drains the blood of the dead enemies he had killed.
Ray dashed after the lady as she ran with all the speed she could muster, her life was in danger so she couldn't afford to slip.
She was still miles away from where Draco and the rest of them were but she had no choice but to run, she turned around to see if Ray was catching up to her only to see Ray at her back.
Ray raised his spear to slash her neck off but she slipped and her legs collided with each other causing her to fall to the ground.
Ray who wanted to slash her neck missed and his spear ended up slashing her back as she fell to the ground.