Zack nodded in reply, silent, meeting the wolf's eyes at her side. He reached in his pocket and retrieved a long piece of soft bark, setting it half-way in his mouth; he then crossed his arms again, and chewed on it, never breaking the gaze from the wolf's.
He was simply another shadow, as he leaned against that tree, emotionlessly angered, and silent about it. He hadn't been back to Hogwarts long, and yet he was already settling back into his old routine. He chewed the bark in a rather wolfish, grumpy way, though he was all-ears to everything going on.
He shook his head, amused, as the wolf finally turned away, and sat by Ginny.