Lucifer was impulsive, but he was not stupid. His impulse got the better of him in most situations, but he had understood his powers as well as he could at this point, and he knew how to utilize it in a battle to his advantage.
As he saw the sand shield appear, he knew that someone was blocking him.
It was either that girl, and she had double Awakening. The reason she screamed with another person's name was to throw Lucifer off to the wrong trail.
The other option was that it was actually another person. He looked around and didn't take long to find that person.
A dark-haired young man was standing there. He had his palms pointed towards the sand shield. It was probably his ability that saved her.
Lucifer knew that resisting the force of the girl would make things more complicated. He thought of something and gave up fighting her force. He started flying towards her instead, supported by the same force.