 "When non-verbal spells are performed, the witch or wizard focuses all their attention on visualising the spell performed...’ Wait, again. "When non-verbal spells are performed, the witch or wizard focuses all their attention on visualising the spell performed...’ Try as she may, Hermione reread the line at least five times, still not paying attention to the words even on the fifth try. Did Draco know she was there? Did he choose his seat on purpose so that he could watch her? Was he watching her?