The exasperated El-Melloi II changed the topic to concrete examples of escape.
“The fact that the room you’re in is linked to the outside probably means that there’s something that harmonizes well with that world in the same location in reality. The most likely possibility is a corpse, but I doubt the influence of an ordinary corpse would extend inside the ward. It must be a corpse under some kind of mystical influence . . . or else the conditions must be right to make it harmonize better with the Servant that’s creating this world. You said that room looks like a workshop.
What are its characteristics?”
“Well, there are a lot of decorations and things that look Mesopotamian.”
“. . .! I see. If that workshop does belong to that Heroic Spirit’s faction, then asking the chief of police to go there for us would be asking him to go to his death. . . . In that case, we should investigate the Heroic Spirit’s characteristics from within.

Fate/Strange Fake: Volume 6, Interlude ("As Dream and Reality are Both Illusion II")