And so, they did. Between the two of them, they touched as much of the trunk as they could reach. Hermione had started strong on an attempt to climb it, but Malfoy had talked her down: it was unlikely that the key, whatever it was, required such acrobatics from the practitioner. He’d been muttering several spells over the ground near the roots. She was tapping her wand against the bark, experimenting with different rhythms.