With Zhou Yan's entire set of Divine Skills, plus his ghost-like abilities, if he truly gets his hands on those two Immortal Corpses, even if Immortal Techniques were to fly chaotically, they'd still be hard-pressed to snatch them back.
"We must not let him succeed!"
Emperor Bai Zhu said in a deep voice, sending a message to the three Great Immortals of the Eternal Hall: "The Ziyang Immortal Mansion has already used all three of its Immortal Techniques, fellow Daoists, if Zhou Yan isn't stopped now, it'll be too late for regrets!"
The three Immortals didn't need Emperor Bai Zhu's reminder or urging.
They too were paying close attention, and they saw clearly that Zhou Yan had already covered half the distance in the Immortal Corpse Heaven. Judging from his progress so far, it's estimated he would get to the two Immortal Corpses in about seven or eight more days.
But Zhou Yan is cunning.
Who dares to guarantee he's not holding something back?
