A restraining spell created a thirteen-sided object around Fiamma, not only restraining Fiamma's actions physically but also separating his flesh from his soul. He was trapped in a "woundless bind"; nothing more than a hollow existence.

[...]

"From this moment forth, you shall be bound for forty years. Sample the 'loneliness created by oneself' that Judas experienced, and correct that immature soul of yours."

[...]

The Pope expression twisted into one of shock. This was not something someone who had been bound by such a spell should be capable of.

Fiamma's voice adopted a light tone, "How pitiful... just two billion followers? Only two thousand years of history?"

The world disappeared.

The Pope barely managed to see the thing which appeared on Fiamma's right shoulder, alongside a bright light from his eyes, because the very next moment his vision was engulfed by empty whiteness and a violent storm destroyed his surroundings.

Toaru Majutsu no Index vol.16