“I’ll use up this block before you destroy it.”
It was a mystic tool, loaded, not with ordinary bullets, but with special rounds designed to activate spells.
The chief aimed his gun up and fired, as if to signal a shift from defense to offense. He wasn’t aiming at Assassin. He was aiming at the traps built into the ceiling of Orlando Reeves’ police station — his mage’s workshop — around her.
The built-in magecraft activated, temporarily strengthening the barrier around the police station lobby and isolating almost as thoroughly as if it had become another world. If a tank were to open fire inside the lobby now, no one outside would hear a thing.

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