As the emperor's children marine buffed Zuriel aside and put in the code the chaos of the scene was made apparent to him.
Bolters, flamers, chainswords, claws and autoweapons clammering like the end of the world.
But Zuriel's mind was transfixed upon the feeling which flooded out of his only reasonable escape. Pure and utter emptiness and shielding from the warp. There was just cold and silent in there.

A later problem he gathered and slipped inside the now closing blast doors. While standing in there he felt what he remembered as dread mixed with normality, so this is how the world felt before the accident?
Zuriel felt weak and pointless, he hid in a corner, he could not even turn to mist, completely thrown back into the prison that was his life before the liber mechanica.
Trying to regain his composure, he opened the book to read, but the pages were blank.
He violently flipped through the pages, all empty... except page 172 which was the first page he had opened in the book when he found it.
It was not empty, just a single word.

"Wait"

With a far calmer motion he now closed the book and put it back at his hip, reaching for his hellpistol and raising it.
Zuriel found himself sitting behind a barrel, which suited him fine, he was out of sight and none would mind him. At least hopefully until he had gathered himself fully.