“Splendid! A mudslinging contest after my own heart!”
Without warning, the sound of clapping, and a strangely cheerful voice, echoed through the lobby.
The voice was powerful, and made everyone who heard it feel like they were suffocating. Each clap caused a tension like the distant report of a sniper rifle.
“Who goes there?” The chief called out, looking around. But the owner of the voice was nowhere to be seen. In fact, he had a feeling it was coming from the station’s parking lot — outside the barrier.
But that should have been impossible; the lobby was totally isolated from the outside world. The police turned to look at the front entrance in spite of themselves.
Almost as if it had been waiting for that, an abnormality appeared in the barrier. It’s influence had turned the entrance pitch black, but now an index finger ran vertically down the glass part of the door... almost as if it was making an incision.
A young man appeared through the door, seeming to push open the gap his finger had made. “I’ve been spectating from outside. Truly a splendid fight,” the young man declared, energetically clapping.

Fate/Strange Fake: Volume 2, Chapter 3 ("Day 1, Early Dawn")