Pretending to be motionless, Rose focused all her attention on the other three Children of Salazar, still engaged in a discussion from which she couldn't grasp anything useful. She focused on Non-Verbal Spells. She took her wand - crushed between her skin and the elastic of her leggings - and pointed it at Calypso. An opaque film surrounded her, paralyzing her. The two boys didn't notice, too busy threatening each other, but Rose knew she had to hurry. She concentrated once again, then Petrified Dorian and finally Dylan, who, recognizing Petrificus, had brought his wand forward to defend himself.