The remnant inside Lu Zihao started stirring again after hearing Jin Liwei's involvement in the matter at hand. Feelings that didn't belong to him started flooding his psyche but he quickly suppressed them. He subdued the remnant which was currently insisting that it wanted to see its third brother, talk to him, and re-establish their precious brotherhood.
In the end, he won another temporary battle. But if he continued on like this, his sanity would eventually fray. Bloodlust started leaking out of him again, as he reinforced his will on the remnant.
There was no way that he, Nikolai Vetrov, would allow a mere remnant to defeat him and kick him out of this body. It wasn't even a complete soul but only a small, annoying piece that refused to let go of the body and the original Lu Zihao's attachments in the world like the brotherhood with Jin Liwei and the others.