He wanted to avoid him but considering the fact that he lived at his house, or better phrased, palace, it was obvious he wouldn't be succeeding.
Also there was this thing too where Lun just couldn't simply let anything Xan says go. It was as if the man had been rooted in him like a very mischievous parasite that he couldn't let go.
He was describing him in his mind the most horrible way, trying to picture him with horns and a funny nose but as he left the library and watched the white haired vampire lazily lay back on the wall he just couldn't think of him as a caricature anymore.