"Hold him down!" Iris roared, while Lou thrashed his body on the sand. He felt his guts were being ripped apart.
The pain was unbelievable!
Cezi and Cedric immediately came to help, they held Lou down, while Iris tried to get Rei's spirit out of his body.
This was why, Rei was called as spirit and why had this ritual where he needed sacrifice, just like Decratic, he didn't have real body. The only thing that was left of them after five centuries was only their spirit.
Because of Rei's entanglement with Decratic, he preserved Decratic's existence within his own. Just like what he said, he wanted the existence of Decratic, so the circle of Serafim would never end.
Rei selfishly retained Decratic's existence, keeping the devil not strong enough to cause trouble, but it was enough to not cut the circle of the Serafim, so he could meet with Na again one day.