Almost instantly, the Pope was smothered with a force so overwhelming his body was once again sent flying. The plaza of the Basilica di San Pietro was so severely damaged only rubble remained, the aftershocks of the explosion having caused all the surrounding structures to collapse. The already heavily-damaged structure of Basilica di San Pietro had incurred even more damage. A part of the perimeter wall separating the city-state of Vatican City from the city of Rome crumbled, and the Pope was blown completely out of sight.

[...]

Staring at the other side of the thoroughly destroyed wall of Vatican City, Fiamma realized: The damage was too minimal. The shock wave he emitted should have leveled several hundred meters of Roman streets outside Vatican City to rubble, but only the interior of Vatican City was damaged; everything outside it was completely unharmed.

"So you drew the entirety of my attack upon yourself? Such an impressive bastard."

Toaru Majutsu no Index vol.16