Kiritsugu again used about three hours to break through the protective magecraft formations in order to enter the Tōsaka mansion, his next target.

His methods were already close to miraculous. The bounded field that Tōsaka Tokiomi set up was a first-rate security system specifically guarding against magi, and was created with magi in mind to begin with. It couldn’t be broken through by sheer magecraft even if attacked continuously for a whole year. Kiritsugu could overcome this bounded field in a short time precisely because he was someone who did not seek results by way of magecraft and fought against magi by perceiving traps wrought through magecraft.

However, no matter how comparatively quick he was, it was long enough to make Kiritsugu anxious in the current state. He had never wasted this much time on the battlefield. He had finally broken through the protection between the inner porch and the living room, but Kiritsugu was still tormented with a nameless anxiety the moment he arrived in the main lounge. Although he passed through the protective barriers at the risk of his life, it didn’t mean he was guaranteed to find Irisviel, just as had happened at the Matō mansion.

- Fate/Zero: Act 14, Part 4