Lucien wouldn't mind killing his enemies without a second thought. But Enzo was not an enemy, just a jealous idiot.
He knew the Bloody Rose was influencing his feelings and making him more violent and unstable. So Lucien wants to solve the problem with Enzo passively in order to prove to himself that he is the only one in control of his own body.
Lucien spoke calmly to Enzo. "You can't lose her because you never really had had her heart."
Enzo was even more furious. "You don't know what you're talking about!! We met in a slave ship nine years ago, and since then, we have promised to protect each other forever."
Lucien was curious about Neola's story. All he knew was that she came from the eastern continent, but he hadn't had many conversations with her yet.
But he didn't want to know about her from others, so he stayed focused on the Enzo issue.
"And now you want to prevent her from getting stronger just because you won't be her husband? Is that how you show your love?"
Just to be clear, there will never be NTR in this novel. All Lucien women will never even look at other men. But Lucien did not kill Enzo because he did nothing against Lucien and his family. But yes, this chapter was not good and I don't think it matches Lucien's personality very much. Anyway, think of it as him trying to be friendly at least once. Also, Lucien still did not see Neola, Kylee, and his female troops as his wives, but none of them will think of another man in their life, and in the end, all, even his female troops, will have his tattoos and be recognized as his wives.