Elena sent Sasha away to a place where not even The Lord could save her. It was over and Lucifer wouldn't have the chance to get her anymore.
Lucifer had enough of Mykel's bullshit and all his creations that made him look like a fool. He didn't hesitate to gather all the power into his fist and thanks to the Lord's light that basked his body with it made him a lot stronger.
The moment Lucifer threw his punch at Elena, Elena blocked it with her arms, and it knocked her back quite a distance. He put in a lot more strength compared to when he punched Farbauti and Erebus, but Elena was fine, not even a scratch on her body.
Lucifer felt like he was being mocked when she saw Elena chuckling and brushing off her arms. He didn't hesitate to throw multiple punches and kicks at Elena, but no matter how long he was basked in The Lord's light, it didn't matter.