Harry just had summoned the left arms of seven Death Eaters who had not attacked him first, killing the seven. At the moment, the courtroom was silent, and everyone was staring at Harry in shock. Rita Skeeter’s eyes were wide (behind her transparent-blue shield), and her green quill was motionless in her hand. Percy Weasley, whilst still sitting in his chair, was turned about to face Harry fully, and Percy was staring in shock and/or fright.