Percy fell unconscious because of the lack of oxygen. Then Carter let him breathe and revived him again.
Once he gained back his consciousness, Carter once again put him in the nothingness state and tortured him with air suffocation.
The man was very hardheaded. But his mind was soon broken.
He started at first with spilling curses and threats at the shadow.
Then he went silent, accepting the fate he was in.
Then he begged.
"Please kill me... I don't want this... Please kill me... Arghhh..."
Percy was knocked out again. The feeling of your lungs slowly collapse was haunting.
Then he woke up again.
Carter placed the contract in front of him again. He actually didn't need him to sign the paper. Carter just did it to build up the lore and legend of Satan.
Keeping the actual way Satan acquired Souls a secret was also a good idea. If he met any powerful being in the future, Carter could throw them off course.
