As the hematophage had shouted, a hell had manifested between the hospital and the church.
A thick fog enveloped the area. The roadside trees morphed into bluish-black plants no one had ever seen before. The craters Alkeides had made filled with red magma and gave off poisonous steam. Human-faced bats flew through the air. Imp-shaped flames surrounded the traffic lights. Countless illusory, sooty buildings, suggestive of London back allies, appeared. But...
There was not a person to be seen.
No children stealing bread out of starvation. No one beating those children to death to take the bread. No dealers peddling narcotics. No constables taking their money. Only the figures of gremlins playing at mimicking their actions with puppets loomed up through the fog.
In other words... that hell was no more than a comical puppet show. Pumpkin lanterns straight out of a fairy tale grinned under the street lights without a shred of reality.
At the same time, however, it was an embodiment of the desires harbored by people of Jack the Ripper’s day. If it had been a different aspect of Jack, the scene might have been an irredeemable hell built of raw human evil. The hell Jack had made manifest on earth in this instance, however, was the corruption of humans by the absolute evil called demons. It could be called a manmade hell, the product of a twisted wish to foist all tragedies, all human evil, on the products of imagination.
Mixed in with that distorted, immature hell was a single genuine article.

Fate/Strange Fake: Volume 4, Chapter 13 ("Day 2, Night")