It's probably better that Volanz didn't try to snark back at her. Not that she would have done anything, but it would have become abundantly clear who was the more verbally gifted in this conversation. Right after she buried him in a trench of sarcasm.

Instead, he gets something a little more skeptical.

"...On what Alternia did you grow up. I am pretty sure that there were carnivorous plants out in my forest, or else I must have had some long-standing hallucination. Either way, I wouldn't write that option out completely. Just because they haven't moved yet doesn't mean that they won't."