Lucius knew full well the pain she must be in in that moment, it didn't feel good to have hurt Buffy. Even though it had been in self-defense it had been against the only part of Daniel that was still around. The cold and calculating Lucius knew that she was dangerous to his plan and should be disposed of but nostalgia was a bitch.
After her previous wild attack, Lucius despaired as Buffy decided to do the same again essentially. Was she deliberately trying to get herself killed here? He caught her foot by the ankle but the impact sounded a loud crack that caused him to grimace. He was pretty sure that he had just succeeded in at least fracturing one of the bones in his arm. He had not anticipated the strength of the intended kick.
Gritting his teeth he shoved her leg up over Buffy's head, cursing under his breath at his own stupidity of blocking in that way with her. With anyone else it would have been fine but instinct had assumed he was dealing with a normal human.
"Any time you want to stop fighting is good with me" Lucius told her with a scowl, moving his arm was now very painful and sent short sharp bursts along his nerves. He could have healed himself, at least partially but then he would be distracted and left open to further damage. Evie wouldn't thank him for breaking anything once she realised that the more he needed to heal, the more she would have to bleed.