"I don't know who that is but... don't worry... if we found it, I will assist you." That's all he could say to her.
"Dear, sorry for interrupting..." Lena approached suddenly and placed her delicate hand on his shoulder, having lost the spar, she was proud, it wasn't much she actually taught him except for the usage of the Profanity of Blood, still, there was something else she couldn't teach him.
The Vanity of Blood, she knew who could do it, but she'd never accept it.
They never discussed it and never would.