The chief recited a brief incantation to control his familiars, and the evil spirits lunged toward Assassin in unison. The officers readied their Noble Phantasms. Then...
“...Ichor of Reverie: Zabaniya...”
No one in the lobby caught the black-robed figure’s murmur. Just as only one other person could hear the “song” that emanated a moment later from Assassin’s throat. “Ugh! What the—?”
Hansa had been about to sip his coffee — now lukewarm due to the blackout — when the cup nearly slipped through his fingers. He pressed his hands over his ears, and turned to look at the source of the sound. He could see that the Heroic Spirit was indeed singing through an opening in the explosion of hair.
Narrowing his eye, Hansa attempted to rationally analyze the sound.
“Well now... this lady’s got a range most people can’t hear.”
As he said, the noise was inaudible to the chief and his officers. But that didn’t mean their bodies were deaf to Assassin’s song.
Soon, its results began to register in their eyes.
“Ngh...?”
The chief sensed an unusual heat coming from his own magic circuits. At the same time, the scene around him began to spin drunkenly.
What? What’s happening to me?
The change sprung on the chief and his officers before they could grasp what was happening. “Wha—?”
One of the officers was being attacked by a demon beast. He caught its fangs on his curved sword.
It was more than just the one beast. All the familiars that should have been attacking Assassin were beginning to lash out at the surrounding police officers.
And that was not all. The officers themselves were unsteady on their feet, as if they — like their chief — were experiencing something like vertigo.
“She’s... making our magic circuits go out of control...!”
Despite his faltering legs, the chief managed to call off the beasts. An instruction to his familiars was enough. If he had tried to use offensive magecraft, the magical energy would likely have escaped his control and destroyed his own body.
It probably has a direct effect on the brain of even a non-mage.
It was possible that the reason for their intoxicated state had nothing to do with magic circuits — that something had delivered a direct shock to their brains — but at the very least it seemed to be entirely separate from the hair-extending technique.
I was careless. She must have two assassination techniques worthy of the title “Noble Phantasm.”

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