Again with the fire! Is it natural, or magical? It's hard to say. There's a spell Rukia can cast that would protect the others from magic attacks, but it'll also prevent them from being cured if they're bit or slammed. However, it seems like the physical attacks are far less of a threat than the fire and lightning. She'll have to go for it.

"Be on your guard! Once I cast this, I won't be able to cure you anymore!" Rukia warned, calling Yuki back. In the chocobo's place, a burst of light appeared, fading to reveal a hissing velociraptor, baring its fangs at its enormous quasi-counterpart.

Yuki 'kweh'd in open distaste. The velociraptor's head snapped around as it whistled sharply at the chocobo.

'Mincing about with no feathers? You look like a shameless strumpet.'
'And you look delicious!'

Unaware of their bickering, Rukia cracks her whip to the side to turn their focus back on the enemy. "Reflect!"

The smaller dinosaur hunkered down, then shrieked, whipping its tail back and forth as bright blue energy flared around Aya and Jack. So long as the fire was magic-based (and Rukia strongly doubted that it was normal), the dinosaur would get a taste of its attack if it went after them.