Hearing the other person's voice - she'd never really gotten to know Tatsumi, after that first spate of curious (self-interested) questions when she'd first arrived, had she? - terrifies her still more, though she cannot hear the exchange very clearly, she can discern tone quite well, and that wasn't what she'd thought it was, something was very very wrong-

Teeth flash in a terrifying smile in the darkness, and the fear in America's voice, more than the words themselves, send her fleeing into the darkness.