"I'm not playing with fire; I'm putting it out." I finished speaking, and my ears subtly emitted a wave, something I myself didn't notice—these ripples in the air were actually low-frequency ultrasound.
Immediately, Brother Wolf whispered to the people around him, "Disable him, keep him alive for Master Hill, the rest we don't care about."
How Master Hill handles this cop is none of his business, anyway he doesn't have the guts to resist killing a cop, so he only serves as the minion to capture people.
After saying that, thirty thugs gave a low shout and surged forward.
I remained calmly standing in place.
The researcher in the biology lab had said that bats constantly emit ultrasound waves inaudible to human ears as they fly; when these ultrasound signals hit any obstacle, they reflect back to the bat's brain, and after analyzing the frequency, amplitude, and interval of the echo, the bat can quickly deduce what action to take next.
