chapter 33 "the sound wasnt human. it cut into tally's ears like a vibrasaw striking metal..." why is this text sugnificant?

She tries to run for the Special with the canister, but the Special ducks away with superhuman agility. The operation has done more than make Specials look terrifying, Tally realizes. Before the Special can go after the Boss, Tally manages to kick the canister open and run away. The Special screams, an unnerving sound that raises the alarm amongst her fellows. They lead her away and find Tally hiding in the forest.