It seemed to shake the spells off like water on its scaly hide. It wasn't a matter of what the creature was, as technically there was still a wizard inside there. A very young, very desperate, very terrified wizard who got himself into all sorts of trouble. But what use was a curse if it could be so easily magicked away? The curse acted as a sort of shield itself, surrounding the creature the same way it surrounded the wizard's mind. Impervious, inside and out.

Being slowed down, if only briefly, seemed to enrage the creature. It leaped off the shelf, slamming onto the floor on all fours, charging toward the teacher. But the shield stopped it. The creature didn't even touch it, but rather seemed to sense the magical barrier and halted a few inches short. It stayed low to the ground, its thick, scaled tail raised high and flicking like an angry cat. Claws, glistening with venom, dug into the library floor, itching to dig them into the teacher instead.