Hermione found her vision sharpen slightly allowing her to see a fresh set of tormentors, the Malfoys and the Carrows. Her head snapped to attention as she could hear Barty Crouch address her. "So, little Muddy you’ve seen the lengths we’ve taken to keep you in check. You can thank your masters later for helping to hone your attention to the only things that matters now...your betters. You will only be able to hear and see Death Eaters, everything else will be a fuzzy muffled blur until we choose otherwise, your sole focus should be on your masters, if you prove yourself trustworthy, you might earn some sight and sound privileges back, or if you misbehave we might have to deprive you of stimulation". Hermione understood the truth in his words as suddenly all background noise was silenced, her vision blurred, making the Carrows disappear from her limited field of vision, allowing her to only see the immediate Death Eater in front of her.