"It seems he knew all along that the other was the reincarnation of the Blood Emperor..."
Seeing Frubor also pay respectful homage to Lin Yun, the Ghost Practitioners were once again shocked. At the same time, some of them noticed the content of Frubor's words, and even some remembered Frubor's earlier behavior.
Indeed, Frubor had been present for some time, but he had not taken any action. His earlier behavior seemed to indicate foreknowledge of something, but at that time, everyone was distracted by the identity of this spirit and didn't have the opportunity to pursue the matter further.
Now it appears that Frubor must have known this spirit's identity all along, which is why he had refrained from taking action.
"This guy, he deserves to die, knowing all along that this spirit was the reincarnation of the Blood Emperor and yet not warning us..."